System Three WR-155 is a high-build waterborne two-part epoxy primer specifically formulated as a sandable base for System Three topcoats. WR-155 contains corrosion inhibitors and is opaque and lead-free. WR155 is non-flammable and contains no hazardous air pollutant solvents (HAPS) or heavy metals. It is low VOC and cleans up with water.
WR-155 Primer may be used over polyester or epoxy resin surfaces, and properly prepared wood and metal surfaces. Use the primer to provide a smooth, uniform surface for the System Three polyurethane WR-LPU Topcoat. It can also be used to help poor hiding topcoats look uniform and opaque. This product is available in a Grey color only in quarts and gallons.
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Total Solids by Weight: 55 Percent
Mixed Viscosity: 200cps
Coverage: 350 square Ft/Gal
Tack Free at 77 degrees F: 4 hours
Recoat Time at 77 degrees F: 12-24 hours
Full Cure Time at 77 degrees F: 7 days
Number Of Parts:
Topside Paint Primer
does this primer work well with West System epoxies?
Yes, i used west system, them primed with this. It worked well for me. Make sure to sand thoroughly before applying the primer. Also make sure primer is TOTALLY dry before sanding.
Yes, but as with all epoxies, be sure to scrub off the amine blush with water and a scrubbing pad. I did my Core Sound 17 this way and am very pleased with the final finish.
I see no reason why the primer would not work with West epoxy. However, West adheres to a properly prepared surface at least as well as the primer so using the primer seems like an unnecessary expense. The only exception might be if you want the colour of the primer to show through but using a epoxy tint with the West epoxy would accomplish the same a much lower cost..
Epoxy primers are designed specifically to act as a bonding layer between epoxy and all paints. I used S3 epoxy primer exclusively on the glue lap sailboat I built last winter for all painted surfaces. It levels out nicely and is very easy to sand to a very smooth surface if sanded within a day or 2 of application. It gets very hard after a couple days. With a well faired surface I went directly to 400 grit paper after priming.
After year over West systems epoxy no problem.
I have used the primer over MAS and West System with great success. It sands well and I used System Three LPU over the primer. You can see a photo on p. 62 of Small Craft Advisor magazine. Tom B
As long as the west epoxy is fully cured and the "blush" removed (soap and water) the primer works well. Tip: Primer does not fill cracks but add a bit of Cabosil to a small amount of primer and small cracks can be filled. Prime right over everything and sand away!
Does it matter how long the primer is left on before the topcoat goes on?I ask because I am anxious to go ahead and get my epoxy coated, plywood boat shielded from the sunlights UV. Some parts of the boat are already going on three years old.
WR-155 Primer will get harder as it fully cures. There is a window of time, within a few days after spraying, when it will be easier to sand before it is fully cured. The only downside to priming early and waiting before you topcoat would be missing this window of easier sanding. One other option is to put on one or two coats of primer and then wait until you're ready to topcoat for the final layer of primer. These primers are thin and do not hide flaws so it's normal to use more than one coat. Just be sure to sand and clean before your final coats in either case. Do a Google search for "System Three Application Guide" for more info.
I don't think it matters how long before you topcoat it. I would lightly sand it then thoroughly clean the surface shortly before you put on your final finish.
Can latex paint be sprayed over this, with no problems?
I don't see any issues, but I HIGHLY RECOMMEND using the proper System Three two-part water based linear polyurethane paint WR-LPU; "STR-156004", which comes in several different colors, and will ensure the appropriate bond, thank you.NathanJD Store(401)253-2986 ex130< a href="http://firstname.lastname@example.org" target="_blank">email@example.com< /a>
Great paint as it gives a tough epoxy base while drying for recoat in hours alowing multiple coats in one day. Best of all it can be sprayed at home without worrying about dangerous and toxic fumes. I was able to spray in my basement without any significant fumes in the house.Best applied in cool temperatures and high humidity to avoid a rough surface.Also applies very well with a foam roller. I found that there was no advantage to tipping with a foam brush as the paint flowed out beatifully on its owb while the brush left streaks.
Using water borne wood finish products for furniture on a regular basis, this was the first water borne epoxy primer I have used. It was easy to mix and apply but be aware, the pot life is greatly limited by temp/humidity. Plan on discarding the first applicators and if applying in 80 degree F weather, use a 2-3 hr max pot life. Also, the coverage was greater than expected as it refers to recommended film tickness. The gallon can provides 2 coats of rolled on coverage for the square footage cited.