System Three  WR-LPU Linear Polyurethane Topcoat
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  • System Three  WR-LPU Linear Polyurethane Topcoat

System Three WR-LPU Linear Polyurethane Topcoat

System Three WR-LPU Topcoat is a two-part, water-based linear polyurethane enamel. This reducible topside paint provides appearance and performance equal to solvent-based paints. WR-LPU topcoat comes in clear gloss, clear satin, and 12 popular colors. When cured, it is resistant to moisture, solvents and fuels.

WR-LPU contains UV absorbers and will not yellow or lose gloss for years, depending on exposure. WR-LPU kits contain a can of paint and a bottle of crosslinking material.The paint by itself cures to a very high-quality coating without the crosslinker. However, adding the crosslinking material produces a tougher and more durable film. It will be more chemical and fuel resistant, have better gloss retention and generally last longer.

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Tech Spec Product Info User Generated Content

Recommended Uses:

Use WR-LPU for both interior and exterior surfaces. It is not intended for continuous below waterline use. Used as a clear finish without the primer, it can beautify and protect wood from discoloration and degradation.

 

  • Mix ratio by Volume: 2 oz/Gal
  • Solids by Weight: 36%
  • Mixed Viscosity: 75-80 KU
  • Application Temperature Range: 55-90°F
  • Coverage: 350-400 sq ft/Gal
  • Pot Life at 77 degrees F: 8 hours
  • Drying Time at 77 degrees F: 60 minutes
  • Recoat Time at 77°F with no crosslinker: 14 days maximum
  • Recoat Time at 77°F with crosslinker: 24 hours maximum

 

BRAND: System Three
Number Of Parts: Two Part
Type: Topside Paint
4.1 10

REVIEW SNAPSHOT®

by PowerReviews
System Three - WR-LPU Linear Polyurethane Topcoat - Water-borne
 
4.1

(based on 10 reviews)

Ratings Distribution

  • 5 Stars

     

    (4)

  • 4 Stars

     

    (4)

  • 3 Stars

     

    (1)

  • 2 Stars

     

    (1)

  • 1 Stars

     

    (0)

90%

of respondents would recommend this to a friend.

Pros

  • Easy to clean (6)

Cons

    Best Uses

    • Small areas (6)
    • Large areas (4)
      • Reviewer Profile:
      • Avid do-it-yourselfer (4), Casual do-it-yourselfer (4)

    Most Liked Positive Review

     

    Good product with the right prep

    I've used this product on a boat build before the one that I'm currently working on. On that first build I had good results with the "roll and tip" method. Howeve...Read complete review

    I've used this product on a boat build before the one that I'm currently working on. On that first build I had good results with the "roll and tip" method. However, I still thought it could look better as there were subtle streaks in the finish.

    For the current boat build I used a HVLP sprayer with a 1.5 mm needle. I painted the interior of the boat with this method. The problems that I encountered were easily resolved still annoying.

    I prepped the area with the manufactures recommend primer and sanded (a lot). Cleaned with alcohol and masked off the area to be painted.

    Setting up the viscosity was easy since it just requires mixing in some clean water. I did a few test sprays to get the flow right and started painting. The first problem that I encountered is that the paint went on with kind of a rough finish and the individual droplets weren't flattening out and merging together very well. This left the surface rough. I live in FL and the temp was right around 80 and the paint was partially drying before it hit the surface. To solve this I got a bucket of ice and put a coil of my spray hose in that. It solved the problem.

    Additional problems are that this stuff needs to be sprayed VERY thin with multiple coats or it will run, especially on vertical surfaces. That required sanding and reapplying. Lastly because you're limited to 24 hours between re-coats (without sanding). So if you figure you want 3 coats (at least), and it takes about an hour between coat and add it the time to actually paint the surface then you need to plan accordingly.

    After I finished coating the interior I went back over it with a 600 wet sand. The instructions say you can sand up to 1800 for a gloss finish. But this was the interior and I was very happy with the results after the 600.

    In the end this product produces a fantastic looking highly durable finish. It's a little finicky and requires a degree of "elbow grease" to get that final great result.

    VS

    Most Liked Negative Review

     

    WR-LPU review- difficult to use

    WR-LPU-review. First the good parts. There is almost no odor. It is easy to clean up with water and the polymerized paint is hard. Now the bad part. It rolls like bubble bath...Read complete review

    WR-LPU-review. First the good parts. There is almost no odor. It is easy to clean up with water and the polymerized paint is hard. Now the bad part. It rolls like bubble bath and gives wall to wall bubbles. When it is tipped with the best camel hair brush, you get twice as many tiny bubbles. With high humidity and cool temp, and a lot of luck, they may disappear when it is dry. If you tip with more than two or three swipes, it gets ropey and sets up that way. I put on four coats with the recommended West System roller, solid foam roller, short velour shureline roller and also the finest camel hair sign painters 3 inch brush. It never went on the same on any coat. Very frustrating. The brush was best.If worked too much with a brush you can get a fine herring bone pattern hours later when it dries when you thought you had a good finish. The non-polymerized paint was recommended for the first coats but adhesion was poor over sanded old polyester resin. When sanding, it did not feather out but suddenly came off in ribbons or sheets especially when you got near edges. With polymerization with each coat, it sands OK but with an 8 hour limit between coats you pretty much have to sand every coat-which I did. It fish-eyed and cratered for no apparent reason even on a second or third coat over a good coat. Go figure. It gets very hard and is difficult to sand when hard. I finished the job with a different finish. I really wanted to be able to use this water born finish for inside work but I was badly disappoined. I will still try using the polymerized WR-LPU clear gloss. I have been know to be stubborn.

    Reviewed by 10 customers

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    5.0

    Great and esy finish

    By Lucky Dip

    from Ontario Canada

    About Me Casual Do-It-Yourselfer

    Verified Buyer
    Ensign

    Pros

    • Dries fast
    • Easy To Clean
    • Even Paint Distribution
    • Safe

    Cons

    • Best Used When Cool And H
    • Sensitive To Temperature

    Best Uses

    • Large Areas
    • Small Areas

    Comments about System Three - WR-LPU Linear Polyurethane Topcoat - Water-borne:

    This was my first attempt at spray painting anything and I am delighted with the result. If you apply very light coats running is absolutely minimal. For the few runs that did occur I would remove them immediatly with a foam brush. Becaause the paint dries sufficiently to recoat in a dew hours, multiple coats can easily be applied in a single day.
    This paint gives off virtually no fumes and requires no special breathing protection beyond a regular respirator. Nice!
    Because it dries quickly bugs and dust are not a problem.
    Different colors seem to have different hiding qualities. The Whidby white covers well while the sinclair yellow reqrires at least two extra coats to get a full deep finish.
    While not considered a high gloss paint it is very close to one and moe thaan sufficient for my purposes in painting my boat deck where I prefer a slightly less glossy finish. A gloss clear coat can be added if necessary.

     
    4.0

    One of a kind

    By Graham

    from Ontario Canada

    About Me Casual Do-It-Yourselfer

    Pros

    • Easy To Clean
    • Fast recoat time
    • Safe To Use
    • Tough finish

    Cons

    • Temperature And Humidity

    Best Uses

    • Large Areas
    • Small Areas

    Comments about System Three - WR-LPU Linear Polyurethane Topcoat - Water-borne:

    The critical factor with this product is that it is safe to spray. Other epoxy paints are far too dangerous to use without a professional spraybooth and related equipment. As other have said, the temperature needs to be cool and humidity high as the paint is waterborne and dries too quickly otherwise.
    I was able to get very satisfactory results spraying this paint in my basement using a cheap HVLP sprayer. This was my first time using a spray gun so obviosly I was learning as I went. It took several tries but in the end the finish is far better than anything I have been able to do with the roll and tip method.
    Resist the temptation to put on heavy coats. You can recoat within 30 minutes anyway while removing runs means waiting a day and then sppending a lot of time doing heavy sanding. I found that wiping runs with a foam brush immediatly was best. It left some brush marks but those were much easier to sand and level than runs. It took 60 grit paper to sand runs the next day as this paint is VERY tough even before the epoxy fully cures.
    The finish is satin - not gloss although you can apply a clear coat for that purpose - which I have not tried. In my case I am painting the deck of my sailboat and I wanted a satin finish to reduce glare and make imperfections less obvious. I seem to have a slight but amazingly even orange peel on the finish. My wife really liked that effect and creditied me with the skill when in fact I just wasn't able to do otherwise. In truth I like the fact that it has a hint of texture too.
    If you are satisfied with a satin finish that is safe to apply, a breeze to clean up, is tough as nails and looks great, this paint is the only one out there that I am aware of that can do all those things well.

     
    5.0

    Great Coverage and Ease of Use

    By Phil Ohio Martin

    from Austin, Texas

    About Me Avid Do-It-Yourselfer

    Pros

    • Easy Brush Application
    • Easy To Clean
    • Fast Dry For Quick Recoat

    Cons

      Best Uses

      • Short Time Water Contact

      Comments about System Three - WR-LPU Linear Polyurethane Topcoat - Water-borne:

      Good leveling characteristics but be sure to monitor runs on vertical surfaces. Do not walk away from project until surface sets up. I was able to put on three coats within a two hour period. Be sure to mix only the amount you can use up in less than a half hour to be safe. I highly recommend this product.

       
      5.0

      Great Paint

      By R.Stiltskin

      from Cultus Lake, B.C.

      About Me Avid Do-It-Yourselfer

      Verified Reviewer

      Pros

        Cons

          Best Uses

          • Easy clean up
          • Relatively non toxic

          Comments about System Three - WR-LPU Linear Polyurethane Topcoat - Water-borne:

          You need measuring cups to mix batches. I used this paint to redo my cars aluminium wheels. Looks great. Bainbridge White is a lighter grey than the comput er paint chip shows. Too bad there was not a larger of choice of colors. Have enough paint left to paint my boat.

           
          4.0

          Good product with the right prep

          By Shudoman

          from Orland, FL

          About Me Casual Do-It-Yourselfer

          Verified Reviewer

          Pros

          • Easily to Spray
          • Easy To Clean
          • Very Durable

          Cons

          • Limited re-coat time
          • Runs easily

          Best Uses

          • Detailed Work
          • Large Areas
          • Small Areas

          Comments about System Three - WR-LPU Linear Polyurethane Topcoat - Water-borne:

          I've used this product on a boat build before the one that I'm currently working on. On that first build I had good results with the "roll and tip" method. However, I still thought it could look better as there were subtle streaks in the finish.

          For the current boat build I used a HVLP sprayer with a 1.5 mm needle. I painted the interior of the boat with this method. The problems that I encountered were easily resolved still annoying.

          I prepped the area with the manufactures recommend primer and sanded (a lot). Cleaned with alcohol and masked off the area to be painted.

          Setting up the viscosity was easy since it just requires mixing in some clean water. I did a few test sprays to get the flow right and started painting. The first problem that I encountered is that the paint went on with kind of a rough finish and the individual droplets weren't flattening out and merging together very well. This left the surface rough. I live in FL and the temp was right around 80 and the paint was partially drying before it hit the surface. To solve this I got a bucket of ice and put a coil of my spray hose in that. It solved the problem.

          Additional problems are that this stuff needs to be sprayed VERY thin with multiple coats or it will run, especially on vertical surfaces. That required sanding and reapplying. Lastly because you're limited to 24 hours between re-coats (without sanding). So if you figure you want 3 coats (at least), and it takes about an hour between coat and add it the time to actually paint the surface then you need to plan accordingly.

          After I finished coating the interior I went back over it with a 600 wet sand. The instructions say you can sand up to 1800 for a gloss finish. But this was the interior and I was very happy with the results after the 600.

          In the end this product produces a fantastic looking highly durable finish. It's a little finicky and requires a degree of "elbow grease" to get that final great result.

           
          4.0

          Good Paint

          By rookie

          from Daphne, AL

          About Me Casual Do-It-Yourselfer

          Pros

          • Easy clean up
          • Good coverage

          Cons

          • Not easy to spray

          Best Uses

          • Detailed Work
          • Large Areas
          • Small Areas

          Comments about System Three - WR-LPU Linear Polyurethane Topcoat - Water-borne:

          Order more than you need if you are spraying. You will need to practice. Once you determine the right feed and speed (less and faster for me) it goes on beautifully. Could use more gloss. I will try to polish or clear coat if that does not work. It really does cover ell and finishes smooth.

           
          5.0

          Excellent product

          By Ben TG

          from Williamsburg, VA

          About Me Professional

          Pros

            Cons

              Best Uses

                Comments about System Three - WR-LPU Linear Polyurethane Topcoat - Water-borne:

                I use this exclusively on the skin on frame kayaks I build at Tidewater Small Craft. Over a thick Dacron skin, I first build a thin film of System Three Clear Coat that saturates the weave of the cloth. Then three coats of the WR-LPU using a standard black foam brush. The first coat looks blotchy and dull, of course, but by the time I get to the third, the blotches are gone and it has reached a nice semi-gloss. And what I like best is the strength of finish, very abrasion resistant. This gives my clients a lot more confidence on what is very light-weight boat.

                 
                3.0

                Good news, bad news

                By Big Pete

                from Boston, MA

                About Me Avid Do-It-Yourselfer

                Verified Reviewer

                Pros

                  Cons

                    Best Uses

                      Comments about System Three - WR-LPU Linear Polyurethane Topcoat - Water-borne:

                      I agree with both reviewers, this stuff is nice in some ways, very frustrating in others. To be charitable, let's say it has a big learning curve.

                      I was interested in using it to paint my 20' glass sailboat. I had previously used Interlux 2-part urethane, rolled and tipped, almost 30 years ago. That stuff was very difficult, but in the end gave a nice finish that help up extraordinarily well with a buff-out every spring with rubbing compound. I wanted something without all the toxicity and expensive solvents, so I gave the System-3 stuff on a plywood skiff I just built.

                      I painted over plywood that had received 2 coats of epoxy resin only coating. I used a 4" foam roller (Shur-line) and a 4" foam brush to tip. I thinned with 15%. I only had a quart, the info said 400 sqft/gal, I figured I had ~40 sqft, so with thinning, I was shooting for 3 coats/batches.

                      The first couple of coats went on well. I applied it thinly, fearing sags/runs, but the stuff set up so fast that wasn't much of a risk. I started running into trouble on the third coat, and the fourth was a disaster (I was getting about twice the coverage I planned, so maybe the application was too thin).

                      The problem was that the paint was setting up so fast that even working in very small sections and rolling very fast, I couldn't keep a wet edge. I would up with a blotchy mess.

                      I was painting in probably worst-case conditions. The temp had climbed to near 90, and the humidity wasn't all that high. Things got worse very quickly with temperature increase.

                      The next morning, I got up at dawn (68 degrees) and wet sanded the day before's mess with 220. I then mixed up a last batch and started again. Things went much more smoothly. I had no trouble keeping a wet edge and feathering one section into another. The coat looked pretty even, despite drying very fast.

                      Bottom line, this stuff is very sensitive to heat & humidity. You want cool temps and high humidity. By the end of my first day 2 coat, the temp had gone over 80, and I decided to not attempt another coat, despite having enough paint for one. I tried a thick coat just on the transom, and it set before the tip marks had leveled completely. I decided not to push my luck.

                      The good news is that the stuff has no odor or exotic solvents. I found wet sanding that it is very hard, even after only an overnight cure. The finish is semi-gloss, something I wouldn't want over gel-coat, but good for a less smooth base like epoxy-coated plywood.

                      Would I recommend it? I don't know. I don't think I'll use it on my sailboat. It's just too temperamental, and I'd like something shinier without the bother of a clearcoat or a lot of buffing. I'm not unhappy with my skiff. I've had better finish results with one-parts, but I'm hoping this stuff will stand up better to abrasion. I'm sure I could get better with more experience with it, as it's really a different animal than even solvent based 2-parts.

                      Use it in cool, damp conditions. They say "best results under 85F", I'd say don't think about it over 80 and stay in the shade even then. Work in small sections, don't be afraid to thin and apply a little thicker than you're used to. Foam brushes work OK, I tried a couple of various bristle brushes when I was having difficulty and they seemed no better. AT least with the foam, you can toss it if it gets gummy. I tried by wet & dry brush tipping, and had best results when I just used one brush for both edging and tipping as that kept it wet enough to not get gummy.

                      What I like best about this stuff is the short recoat time. Even on a 10' skiff, by the time you get all the way around, it's dry enough for recoat, so you can paint continuously. That alone might be worth the downsides of this product when I'm working in a distant boatyard and want to get it done in a day. It's just *very* important to have the right day!

                      Recommended with major qualifications.

                       
                      4.0

                      A great finish for small boats

                      By Mark

                      from S. Dartmouth, MA

                      About Me Avid Do-It-Yourselfer

                      Pros

                      • Easy To Clean

                      Cons

                        Best Uses

                        • Small Areas

                        Comments about System Three - WR-LPU Linear Polyurethane Topcoat - Water-borne:

                        I think this is a great product for small boats built with epoxy. It's easy to use once you know how. It cleans up with water, and has almost no smell. You can paint in the basement, and your wife won't throw you out. It really saves time on boats glassed with epoxy, because you can paint right over the well sanded epoxy without priming. You do need reasonable temps to apply this paint, not hot and dry, but that would be hard with most paints. Use the very fine foam rollers sold at any paint or home store, and I use nylon bristle brushs from an art store. You don't need to use expensive brushes, but the they should be synthetic. Thin about 10% with water for rolling and tipping. Apply thin coats, and tip off vertically.The first coat over glassed wood won't look very good, but after 3 to 4 coats it looks great. It flows out nicely, and drys with a semi gloss finish, which nice if you are not trying to create work of art. Use interlux fine non skid particles mixed into the paint for decks. I'm just finishing a custom 17' tri I built, and it's coming out great! I painted a 22' cat I built a few few years ago with it and it looked good after three seasons out on a mooring.

                         
                        2.0

                        WR-LPU review- difficult to use

                        By classicdoc

                        from Southold, NY

                        About Me Professional

                        Pros

                        • Easy To Clean

                        Cons

                          Best Uses

                          • Small Areas

                          Comments about System Three - WR-LPU Linear Polyurethane Topcoat - Water-borne:

                          WR-LPU-review. First the good parts. There is almost no odor. It is easy to clean up with water and the polymerized paint is hard. Now the bad part. It rolls like bubble bath and gives wall to wall bubbles. When it is tipped with the best camel hair brush, you get twice as many tiny bubbles. With high humidity and cool temp, and a lot of luck, they may disappear when it is dry. If you tip with more than two or three swipes, it gets ropey and sets up that way. I put on four coats with the recommended West System roller, solid foam roller, short velour shureline roller and also the finest camel hair sign painters 3 inch brush. It never went on the same on any coat. Very frustrating. The brush was best.If worked too much with a brush you can get a fine herring bone pattern hours later when it dries when you thought you had a good finish. The non-polymerized paint was recommended for the first coats but adhesion was poor over sanded old polyester resin. When sanding, it did not feather out but suddenly came off in ribbons or sheets especially when you got near edges. With polymerization with each coat, it sands OK but with an 8 hour limit between coats you pretty much have to sand every coat-which I did. It fish-eyed and cratered for no apparent reason even on a second or third coat over a good coat. Go figure. It gets very hard and is difficult to sand when hard. I finished the job with a different finish. I really wanted to be able to use this water born finish for inside work but I was badly disappoined. I will still try using the polymerized WR-LPU clear gloss. I have been know to be stubborn.

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