Sika 291 is a Professional grade Marine Adhesive/Sealant used by boat builders and yards to bond and bed boat components structurally. Fast strength build-up overnight. Use above and below the waterline. Comes with nozzle. All purpose adhesive sealant, bond to hull & structural members. Bedding Compound, light bonding, fast cure polyurethane sealant.
NOTE: SIK-291201W is a 20oz. Sausage Pack, which is NOT compatible with standard caulking guns.
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Density: 10.3 lbs per gal
Tack Free Time: 60 min.
Rate of Cure: 1/4-in x 1/4-in bead 9 days at 40F/30% R.H.
1/4-in x 1/4-in bead 4 days at 73F/50% R.H.
1/4-in x 1/4-in bead 3 days at 73F/70% R.H.
1/4-in x 1/4-in bead 1 day at 100F/75% R.H.
Shore A Hardness (ASTM D2240): 45-50
Elongation at Break (ASTM D412): >600%
Tensile Strength (ASTM D412): 221 PSI
Lap Shear Strength (ASTM D1002): 165 PSI
Peel Strength: 35 lbs/in on fiberglass, 25 lbs/in on gelcoat
Application Temperature: 40F to 110 F
Service Range: -40F to 190 F
Color: Black, White
Sandable, paintable and is waterproof
Below Water Line (yes/no):
Rate Of Cure:
Is sikaflex-291 applicable to sealing gap between fibreglass manhole & upvc pipe? Any other product reccommended for this sealing application?
Hi---I'm sorry but I'm not sure. Reason--I don't deal in fiberglass--just wood! SorryDoug
I assume what you want to do is seal this gap so no moisture can enter through the gap. As long as there is no movement and the gap is somewhere around 1/4" or less this product should work well.
Yes it should work great and it is paintable.
What do you use for clean-up?
been using Sikaflex for 30 years now--IT IS THE BEST--best way to do a job is to tape out the area--push the edges down well--this will give you a professional look--if you smudge use lacquer thinner
THOMAS A. KREHL
masking tape...seriously, the virtue of this material is that it will seal (stick to) just about anything. The best way to address the cleanup problem is to avoid having to clean up.
how difficult is it to remove this product and does it remain flexible when cured ?
I did not try to remove it so cannot answer that question it is tough to remove from your hands so wear latex gloves. I found this to be a great product. It does stay flexible. I used it to repair long cracks in the bottom of my Coleman canoe. After the Sikaflex dried I went over that with construction adhesive to make the repair more durable. I have not had a leak since although you need to reapply the construction adhesive from time to time as it tends to start peeling off.
Sikaflex is good stuff. Although I'm not a big user, I plan on a fresh tube for each use, otherwise I use a 1/4 drill to clear out the tip plug. It also gives you a sample to stretch. Flexible and medium tenacious sums it up, sticks well to pre-cleaned surfaces. I've not removed any, but word has it that it comes away easier than the other more aggressive sealants. A sharp blade and soapy water helps in cutting a seam clear. Go goop! Paul
It is very difficult to remove when cured. In fact, it's difficult to remove when still fresh. Remains flexible when cured, but requires a high shear load to see the flex.
IF IT HAS NOT CURED--YOU CAN CLEAN UP WITH PAINT THINNER---IF IT IS CURED--IT IS VERY FLEXIBLE AND VERY HARD TO REMOVE--NEED A CHISAL AND HAMMER..GOOD LUCK
Very easy to remove and yes it stays flexible. We have to re-do joints on our City Waterslide at the pool and this is the product we use because it is easy to work with and easy to remove.
Can I paint 291?
I've had no problem painting any Sikaflex product.
Can this be used to seat and seal a forward deck window on a Hunter 295?
I would say yes. I used it to reseal the side ports on my boat and it's held up nice and watertight for several years now. 3m's 5200 makes a tighter seal, but the window could never be removed again. I found this product to make just as good a waterproof seal, but you can remove it if necessary. One thing I have to stress though, is make sure that all surfaces are good and clean and free from wax. I used lacquer thinner to get rid of any oil, etc...
If it has a metal frame, it should work fine. Don't know if it adheres to all plastic type materials.I used it to seal under rub rail on a '80 21 ft. Hammond Challenger. Still good after 5 yrs.
Sets up quickly it has very good sealing quality
Yes, that's what it's designed for. However, it's a 3 part process: you also have to purchase the activator and the primer solution and apply both to each surface prior to applying the 291 caulk which comes in black. I used this product to attach the plexi canopy of my plane to the canopy frame, thus eliminating rivets or screw fasteners thus reducing the possibility of stress cracks in the future. The plane is capable of 200 mph and I haven't lost the canopy (or my life) yet! Best of luck.
Can this be used to seal hull seams in an old wooden boat? I am looking to seal the oily, problem areas lower and near the stern. I would use 5200 but I am looking for something less expensive and less permanent.
Sikaflex is caulking, i.e. flexible to accommodate the wood planks swelling when immersed. I have used it on Beetle Cats to replace old fiber caulking, with good results. I have read that sealing seams tight before immersion can result in increasing the gaps, by preventing the wood planks from swelling. Pay attention to clean oil off any surface to ensure good adhesion.
sorry, I have no experience with wooden hulls.
I don't think any of these sealants work well in an oily environment.
Is it OK to use on SS drinking water tanks?
According to their data sheet that I found online: "NSF approved for potable water (black & white only)". And it will certainly stick well and seal.
I would say yes--after using this product in the marine business for 30 years it is the best caulk out there--I use it around the house for everything--it is a polyurethane and cures with no evident smell--I'd say use it in good health
THOMAS A. KREHL
The Silaflex 291 Product Data Sheet states"NSF approved for potable water (black and white colors only)
I have no idea. I used it to seal a hatch. However, I would like to know the answer if one is determined. I would imagine that there would be three places to go to get a decent answer: makers of stainless steel drinking water tanks (ask them how they seal the tanks) and Sikaflex manufacturer (ask them the question.) Third option would be makers of medical products involving stainless steel liquid reservoirs for use in hospitals.good luck
Thanks a lot. I wouldn't be afraid to drink water now.
will sikaflex -291 bond to lexan?
don't know - I used it on a wooden boat
I didn't use it on that
I have a pilot house on my boat and where the house and pilot house meet there's a seam that leaks all the time. I want to pull all the old sealant out and re chalk it. Both surfaces are fiber glass what sealant would work best for this application. This area is exposed to the sun?Thanks
I used Sikaflex to bond the cabin windows in my Catalina sailboat to the fiberglass cabin. After a really good cleaning of the mating surfaces with MEK and masking were you don't want the product it went together easy and cured overnight. It is tough, waterproof, UV resistant. The best thing is cleans up really easy with Isopropyl alcohol. It is a standard practice to bond the canopy to the frames on homebuilt aircraft using this product.
Sorry I have not used it yet.
Sealant for wood hull to install thru the hull depth finder?
Yes, Sikaflex 291 is a good sealant for a thru hull.
Sorry, I was in a hurry typing the last answer. Sikaflex makes quite a number of different formulations for different requirements. The 552 has a high shear strength, does not sag and does a really good job filling gaps and sanding.
CHRISTOPHER M JOHNSON
Use Sikaflex 552! It is expensive, but does a really good job as a structural sealant. I used it on all my thruhulls.
CHRISTOPHER M JOHNSON
My experience with Sikiflex has always been good. I'd use it again.
LARRY D. DYKSTRA
Rick,Thank so much, appreciate the info.Don
Sealed my instrument panel from the weather. Waiting to see when I remove the panel will it be easy to remove
Cranberry Lake, NY
Like the product
I wish JD offered the option of shaking the paints they sell.
Used this on underwater seams where the plank ends meet the transom. Really good adhesion, very flexible. I'll use this wherever I used to use Life- Caulk, much better. I fully recommend this for bedding fixtures and hardware also. Good stuff!
Great for sealing deck fuel hatches.
Orange Beach, AL
the product is what it is, easy to workwith and works as lis
On ordering these items, I have always ordered white from every vendor. When I ordered these I made sure I noted white as color of choice. When I got order they were black in color. Product was coded incorrectly and now I have a case of a product I cant use.
Rebeding Deck Screws
Was not packaged well by Jamestown , almost not usable!!!
Toms River, NJ
Use this sealant to install thru hulls and seacocks.
USED FOR EXHAUST DUCT ON STERN
VERY THICK STUFF MAKE SURE ITS WARM BEFORE USE
BOAT IN LAKE ONTARIO
If it's good enough for Marshall Marine.
This stuff is fantastic. Fairly priced and very effective. It sticks and ages very well. I use it mostly for betting deck hardware.
Works as described
I use it for trim around any hardware I put on my boat as well as over the bolts to keep down saltwater corrosion.