Sikaflex 291 LOT is an all purpose elastic adhesive, used to bond floors to subfloors or metallic frames, exterior or interior panels, bonding trim moldings to hull etc. Long open time. The 10.3 oz cartridge pictured above is used in conjunction with an inexpensive caulking cartridge gun. The 3 oz size comes in a squeeze tube and does not require a cartridge gun.
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Density: 10.3 lb/Gal
Tack Dry: 3-5 hours
Rate of Cure: 1/4 in x 1/4 in bead 14 days at 40 deg F/60 percent RH
1/4 in x 1/4 in bead 7 days at 73 deg F/50 percent RH
1/4 in x 1/4 in bead 2 days at 73 deg F/90 percent RH
1/4 in x 1/4 in bead 3 days at 100 deg F/40 percent RH
Shore A Hardness (ASTM D2240): 40 to 45
Elongation at break (ASTM D4132): 700 percent
Tensile Strength (ASTM D412): 200 psi
Lap sheer strength (ASTM D1002): 120 psi
Peel Strength: 30 lbs/in on fiberglass, 25 lbs/in gelcoat
Application temperature: 40-110 degrees F
Service Range: -40-180 degrees F
Colors: White, Black and mahogany
Sandable, paintable, waterproof
Shelf Life: 15 months
Below Water Line (yes/no):
Rate Of Cure:
is it paintable?
Yes, Sandable, paintable, waterproof
JD Tech Team
Is this the one with the Wheel mark or IMO approval?
I honestly don't know
No idea on that. Sorry
Can I use this to seal cracks in concrete sidewalk?
I surpose you could but but I would think a it would be better to use a cement mix?I. If large cracks should be fine?
While I have only used Sikaflex 291 LOT for marine applications,, I see no reason why it wouldn't work to seal cracks if the work area was cleaned, dried, and not subject to very much movement.
We have not used the Sikaflex 291 LOT for filling cracks in a concrete sidewalk, so i would not be able to provide an opinion either way on that question. We use it to fill cracks and checks in 6" x 6" pressure treated timbers that are part of the line of commercial wood playground equipment we design, manufacture, and sell.
I have only used it in deck seams but it would probably work in a sidewalk. I don't believe there would be any problems with adhesion and it should with stand the weather fine. It flows good from the tube so application should be fairly easy. I do believe Sika makes sealent strictly for cement joints.
MACKIE BOAT WORKS
I REPAIR INGROUND PLASTIC/FIBERGLAS POOL STEPS AND HAVE BEEN USING 3M 5200 SEALANT/ADHESIVE FOR A LONG TIME, WONDER HOW THIS SIKAFLEX COMPARESTO THE 3M PRODUCTS?
My own opinion I like it better than 5200. Easier to work with and dries a lot quicker. mostly marine use for me.
Sorry, I don't have a good answer for your question. My experience with the Sikiflex was limited to a failure due to excessive ambient temperature. I never thought the problem was caused by the Sikaflex but the 100 degree dayI was attempting to use it. Also, I really think it would take a lot to upstage 5200 as a sealant anyway. I always joked that I thought I could build an entire boat using just 5200 by itself.
I use the Sika 291 because it is somewhat sandable and toolable. It also has about half the holding power of 5200 which I use for adhesive. Check the chart in the catalog. It gives the holding psi of each product. The Sika is a very good product.
MACKIE BOAT WORKS
It would be very similar. I use the 291 lot because you can continue to use the produce for a couple of weeks after opening. 5200 must be used immediately.
I've used both products and don't see them as alternatives for each other. I use sikaflex as a bedding compound on my sailboat. It provides excellent bedding and sealing for bolted fittings and deck hardware. It can be easily removed and cleaned off when fittings need to be removed and replaced and rebedded with more sikaflex. It retains its rubber like consistency. I use 5200 when I need a permanent adhesive calk. The key word is permanent, thus I use them for two different application and don't see them as substitutes for each other.
what can i use for cement patching ?
3M 5200. It has 2 times the holding power of the Sika-Flex 291. We use it for patching just about anything.
MACKIE BOAT WORKS
I would not think this should be used for cement patching. This is an adhesive sealant, typically used to secure and seal two surfaces together.
clean up ?
Used Sikaflex to fill deck seams on 1958 Chris Craft. Tried to minimize need for clean up by wearing gloves, masking area etc. Mineral spirits worked well to remove excess from varnished surfaces.
Mineral spirits works well if uncured.
I use paint thinner to clean up, relatively easy to do when the sikaflex is first applied, hard to do when cured. If you are joining 2 pieces of wood together with Sikaflex which hasn't been stained/varnished, some of the product can get into the grain even with cleaning with thinner. To remove as much of this as I can,I use the green or maroon scrubbies to clean in the grain. Thinner can clean the hands too, but better to wear gloves. Good luck
Paint thinner/mineral spirits work fine. Scrape excess off and use a clean rag. Any film from the thinner can be buffed off with a dry rag. Cleans up great.
MACKIE BOAT WORKS
I believe I used it for corking my teak cockpit. I used a lot of tape covering everything that was not the grooves I was corking. The only clean up was me and it was the usual, like with 5200.
I use orange grit hand cleaner, one gallon container with push pump, clean hands asap, works great and safe.
can it be used under water?
Yes, with good preparation of substrate(s). Should cure for at least a week before submersion in salt or fresh water. See Sika Corp. tech bulletin.
It's a good product. I have never tried to use it underwater. I hope you are only trying to stop up a hull seam. It may work. But it should set for quite awhile to set up and not wash out. If it is a seam sawdust works on small seams as a last resort. If you are trying to bed a thruhull I think that would be ok. It would cure eventually.
MACKIE BOAT WORKS
Sikaflex 291 LOT can be used for below waterline repairs with great success after fully curing. I don't know that it can be applied under water with good adhesion.
I used it for the teak cockpit bedding. Don`t know about underwater, must say on the tube.
Yes, successfully used to caulk seams between planking blow water line. Use good masking tape to cover the edge of planks... Caulked seams were cleaned and CPES was applied to all stripped planking, including seams.
From SIKA's product data sheet: "use above or below waterline" and also "do not apply through standing water." Note that 291 LOT's two main advantages are 1)long open time (LOT) for "jobs that require more time" and 2) resists salt water.
I had no luck on metal with it.I found surface needs to be fully dry before applying.
can it be used to caulk teak?
Depends on location. I have used it as a caulk on mahogany planking and as a seal around portlights. It remains somewhat flexible after 2 years as compared to 3m 5200
I wouldn't dare to give you an answer on that as i never used it for that.
I cannot answer this question; have very limited experience with the 291LOT. It's main application is its salt water resistance and its Long Open Time (slow cure). Sika's MSDS (Google Sikaflex 291LOT) doesn't answer the question either - probably need to contact manufacturer
Only used with acrylic and powder coated aluminum - no experience with wood
Hi, I tried to give you the numbers and website of the Sikaflex corporation to help answer your question, but I was not able to send you that info. I've used Sika 291 LOT on the wooden speedboats that I restore (Chris Craft/Century or similar)on decks and side planks when there could be a possibility years later when these planks may need to be removed, or when replacing several planks on an older bottom that eventually will need total replacement. However, when I replace inner and outer bottom planks, frames, keel or chines etc on a restoration that will be a permanent installation I use 3M 5200. Sikaflex 291 LOT is a product that I like and use and, to this date, have not had problems with. I suggest you check the Sikaflex website for information on uses with teak. I hope this has been helpful. Good Luck, Howard
Would this product be a good choice for sealing the seams in the shower on a sailboat?
This is the perfect sealant/adhesive for the seams in a sailboat shower. It tools smooth, has a great cleanup and lasts forever. Ensure that the surface is clean and it'll stick there for years to come. Reets Boatworks
I would say yes. I have never used it for that. It is easy to use and cleans up well with mineral spirits. I use it for deck seams on old runabouts because it can be sanded down if needed and varnished over. Also it has half the holding power of "5200".
MACKIE BOAT WORKS
Hi, I use Sikaflex LOT for sealing seams on wood boat decks, and have been happy with my choice. Deck planks on a wood boat move some, so its important to have a product that has some flex, is rubbery, and can accommodate movement, yet is not impossible to remove. This product bonds well with wood. However, I'm not sure of its bonding ability with metal or fiberglass, but I'm sure Sikaflex specs cover that in print. I hope this helps.Regards, Howard Lehman, Iron River, WI
My tube of sikaflex was dried out when I used it....quiteclose to the expiration date when it arrived.I am sure it is an excellent product for this use.
The advantage for Sikaflex 291 is that it flexes after setting. It is perfect for setting windows and ports in a hull. It should work great in a sailboat shower, but less expensive products might do an equally good job.
291LOT is a marine sealant, resists salt water. I think you would have a better choice with a bathroom sealant for a shower.
does sikaflex 291 need a primer?
no,it's ready to go'Like the others say it takes a while to cure.Just used some today.It was kept in the freezer all winter after it had been opened in the tube.I just put a nail to plug the nozzle.
I am assuming you are asking about use on wood? No- you do not need a primer. I used on teak without a prime and it worked very well.
I did not use a primer and had a successful application. I applied 219LOT to clean, freshly surfaced lumber before finishing. Sika does state that primer may be required "to achieve optimal adhesion." I suspect that the need for primer would be specific to what material the 219LOT is being applied to. Of note: LOT = long open time. My application took over a week to set enough to handle the materials after caulking.
I use Sikaflex 291 LOT as an adhesive/caulk, when I need very good watertight adhesion, but not a permanent bond. As I restore old wooden boats I'm most likely to use Sikaflex 291 LOT to fasten wood decks or side planks to their respective battens, along with new silicon bronze screws. If, at a later date, an area gets damaged and I need to remove and then replace a board(s), having used Sikaflex 291 LOT as a bonding agent would make it easier to break the bond than if I had used 3M 5200. Before I fasten these wood pieces together, I always clean any dirt or grease from the boards to be bonded, and then seal these surfaces with a sealer, mostly CPES. I suppose, if one would use the word "primer" very loosely, the sealer does "prime" the surface of the wood to be fastened together, helping the wood pieces bond together better. I hope this is of some help,Howard
Not that I am aware of, I applied it to wood that had been sealed with CPES
NO, we never use a primer
Used it to seal my deck. So far so good
We used this product to adhere urethane-based foam to wood and carbon steel substrates. Bond is performing well. No issues.
New York NY
Sikaflex 291 LOT
Used for bedding the recessed lap joints in Adirondack guideboat planking. The long open time (LOT) is a plus. Just be sure to remove the squeeze out while it is still flowable. Also get it off your hands immediately with a solvent (acetone works) or you will have to wear it off after it cures. Using latex gloves is a better (and safer) idea. Once cured, it is like soft rubber and seals as designed.
Clifton Park, NY
Not exactly what i wanted but it worked.
WE used the Sikaflex 291 LOT for caulking the deck seams on our antique runabout. The Sika brand is the preferred and the best product for the job. However the LOT isn't really what we wanted. The normal or quick cure would have been greatly preferred.
Truly "Long Open Time"
This is equal to 4200 but with a slower cure rate. This allows for a partially used tube to be stored for up to 30 days. Other types curing solid in an opened tube in as little as one day. This does mean the use of the product might take up to a week or more to fully cure but for my project this was not a problem.
COBBS CREEK, VA
Long open time is right
I have used the same tube for about 30+ days and still flows like the 1st day. Re bedding above water line items on a sail boat that I am working on. Tape around fittings for easy clean up.
Sikaflex 291 LOT
We use this product for bedding teak toe rails and hardware on sailboats. It will last in the tube better than 5200. Easy clean up with mineral spirits.