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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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Technical Specifications
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):
Yes
BRAND:
Sika
Material:
Polyurethane
Rate Of Cure:
Slow
Strength:
Good
Type:
Adhesive
Usage:
Bonding
Questions & Answers about Sikaflex 291:
2013-04-29GEORGE STEPHENSON asked: Is this just as good as 292 for recaulking cedar planking?
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2013-05-24ROBERT ANDREWS: George,
Sorry I can't be of any help ... I use Sikaflex 291 to caulk airplane float aluminum bulkheads and side skins. I have no idea how it will work with wood.
Bob
2013-05-24ROBERT PERRY: Sorry. My application was to seal a leak between my concrete swimming pool deck and the edge of the gunite structure. Deck rises when ground is frozen. Works great.
2013-03-13LEO KEANE asked: I am caulking between deck boards on a restored wooden boat. The deck boards are 3" beveled straight grain fir finished with five coats of Sikkens Marine Gloss varnish. Which is the best caulk/adhesive to use in this situation?
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2013-03-15KENAN MORAN: I can't give you an answer because I used it to fill in the cracks in my floor boards. It's works great but I'm on dry land (most of the time) so don't know what I would recommend.
2013-03-15PAUL HARRISON: I would go with the 291. I have had great success with it and the slow cure time does make it a problem for me sometimes it is very strong and has never let me down. So I deal with the slow cure time as the end result. Nothing worse than having to redo.
2013-03-18Dennis Fade: I used it to on a fiberglass boat. To seal the overlap of upper deck and hull.
It flows smoothly and cures firm, but not hard. I cut the excess with an
Exacto knife. Clean/smooth edge.
2013-04-17PATRICK TAYLOR: I am not the one to ask about boats..but I know that it is used a lot for just this situation...It is definitely made for waterproofing...a Geotechnical engineer recommeded it to me for sealing small craks in my drivewayl.
2013-02-28DON DE VRIES asked: I think I need tinsel strength over the 221 lbs. What can you do with the surface strength. Again I am mounting a 27.2cc single cylinder gas engine
to a epoxy glass resin hull that might be a heavy weight glass matt. The RC boat is 46" long and uses 1/4' plywood to mount the motor to the hull. The motor is a 18,000 plus RPM and rated at 4.25+ HP. I think it needs a very strong adhesive. What do you think?
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2013-02-28STEVEN JACKSON: Don D, Sounds like a fantastic project! I do not think Sikaflex 291 is particularly good as an adhesive for an application like this. It is great if used as a sealant when there are fasteners to hold things together (toe rails, etc.) 3M 5200 or 4200, on the other hand, are outstanding and will also provide some vibration damping if applied with a little thickness. They are extremely good adhesives with the downside being that they are also very difficult to remove. For an application like this I would try to mount the engine with mechanical vibration mounts if possible.
Good luck.
2013-03-01joe Shotts: I hear that 3m 5200 is the strongest
2013-03-01GARY MCCRACKEN: Fiberglas (West System) that puppy in! Not sure that sikaflex will do the trick...
2013-03-02LARRY D. DYKSTRA: Don D
My use of SikaFlex has been mostly for caulking and sealing, with excellent results. Your application is outside of my experience.
2012-10-12DAVID ELLIS asked: Can this product be used to seal a porclain cisten, that has a crack and is leaking?
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2012-10-12J T MARSHALL: I do not think so. There should be other products for that application
2012-10-12DOUG SIMMS: David,
I used Sikaflex 291 to join and seal plywwod panels of a 16' skiff. I recently found ahunk of the cured 291. It will cure into a very tough, very strong rubber.
Good luck
2012-07-18A shopper asked: Can this product be painted over with a epoxy paint?
Marty
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2012-07-18WILLIAM CANTOR: Yes, but it is flexible so it MAY crack or peel
2012-06-18NANCY KENDRICK asked: Would this be good to use for replacing flush mount plexiglas windows on an old C&C sailboat
plexiglass to fiberglass?
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2012-06-19JANET HUNKEL: greetings from owner of an old boat--
i used sikaflex to seal plexi to wood and it has been the best solution among many others. not sure on plexi to fiber.
fair winds, janet
2012-06-19MATT WISHNESKI: As a caulk around window it should be a good sealant.
Matt
2012-03-31JOHN S asked: i have an old wood boat - have you used the sikaflex 291 on the bottom as an added protection against water infiltration?
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2012-04-02MARITIME CLASSIC: 291 is great for bottom seams if that is what you are doing. If you need to bed in a plank on the bottom I use 3M 5200, I do not caulk with 5200 because it tends to sag out of the seams and is a little to thin. 291 holds really nice and dries quicker.
2012-04-02john s: thanks...only using for extra bottom protection between lapstrake interface as a caulk...thanks again
2012-04-02JOE SOBOTI: John,
Caulking the bottom of a wooden boat is NOT recommended. Any gaps in the bottom should swell after the boat has soaked suffciently, about 24-48 hours. If you place caulking material in the gaps, as the wood swells, it will push up against the caulk rather than meeting the next board. This will cause the boards to curl and lift off the ribs and frame. It's OK to use a little here and there to fill some bad gaps, but don't run it all along your seams.
2012-03-06A shopper asked: Would this be suitable to repair a delaminated wooden mast?
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2012-03-07GARY FORGUE: Don't know. I used the 291 to stabalize a shower surround (fiberglass Gelcoat) that had some loose joints. It worked great, but is very rigid. Not sure how it woiould work on a wood mast that must have some degree of flex.
2012-03-14GEOFFREY EDMANDS: 291 is more for caulking, sealing, bedding. A glue suitable for wood would be used for gluing up a wooden mast.
2012-03-06A shopper asked: Is it as good as 5200?
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2012-03-06JAMES LAMBERT: It depends on your application. 5200 should only be used where application is intended for permanent use. I used sikaflex to seal a deck hatch access to a fuel tank. If I had used 5200 for that application it would have been much more difficult to remove the hatch if I ever needed to access the tank again. Both products work well for bonding and sealing.
2012-03-07MATT WISHNESKI: Silaflex is a good sealant for boat hulls, keels, small holes in canvas bottoms.
I've been using to repair bottoms of wooden boats for years.
Hope This helpped to your questions.
Matt
2012-03-07GARY FORGUE: Don't know 5200. I used the 291 to stabalize a shower surround (fiberglass Gelcoat) that had some loose joints. It worked great, but is very rigid.
2012-03-14GEOFFREY EDMANDS: I mostly use 291 where I would use 5200. I guess that means I usually prefer it.
2011-12-08JEFF BROWN asked: what is the temp range & cure time as per a current temp?
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2011-12-09KEITH CALHOUN: I believe it was about 50-55 degrees when I used it and took a day or so to cure... Hope that helps.
2011-12-12GARY FORGUE: I applied it in a shower stall at about 65-70 degrees and it cured in a couple of hours as I remember.
I use it for trim around any hardware I put on my boat as well as over the bolts to keep down saltwater corrosion.
Was this a gift?:
No
10/24/2012
5.0
GOOD STUFF!!
By ADEggman
from Agua Dulce, California
About Me Advanced
Pros
Easy to Use
Protects Well
Weather Proof
Cons
Best Uses
Outdoor
Wood Trim
Comments about Sikaflex 291:
Used this to re-caulk decking on my boat prior to applying deck paint. Sika products are all I use when caulking.
Was this a gift?:
No
6/10/2010
(1 of 1 customers found this review helpful)
5.0
Sikaflex for bonding Treadmaster
By Distant Star
from Milwaukee, WI
About Me Advanced
Pros
Easy to Use
Visually Pleasing
Weather Proof
Cons
Best Uses
Bonding Treadmaster
Outdoor
Comments about Sikaflex 291:
Used Sikaflex to bond Treadmaster non-skid material onto a rebuilt bridgedeck. Used a trowel to spread evenly - an easier task than I thought it would be. Sikaflex was less "runny" than I anticipated so clean-up was a breeze as there was little mess.
5/3/2010
5.0
Usages Galore
By Kandoo Mike
from San Jose, CA
About Me Professional
Pros
Easy to Use
Protects Well
Visually Pleasing
Weather Proof
Cons
Best Uses
Indoor
Outdoor
Comments about Sikaflex 291:
Not only for marine applications but for interior as well for bathroom, kitchen, washroom...perfect to keep woods dry from termites. In the trash goes that old hardware store caulking. The reliability and longevity of this caulking is GREAT !!
4/19/2010
(2 of 2 customers found this review helpful)
5.0
great fix for plastic boats
By leaky canoeman
from Pueblo Co.
About Me Advanced
Pros
Easy to Use
Protects Well
Weather Proof
Cons
Best Uses
Coleman canoe repair
Outdoor
Quick Fix
Comments about Sikaflex 291:
I used it to make a repair on an old coleman canoe. It is as easy to use as silicone, but much more durable. I have been trying different things on this boat for years, and I finally found something that works.
3/9/2010
5.0
Just what we were needing :-)
By Dan
from Ohio
About Me Casual/ Recreational
Pros
Easy to Use
Protects Well
Visually Pleasing
Weather Proof
Cons
Best Uses
Comments about Sikaflex 291:
we knew the type of product we needed but didn't know what we needed... Chatted with someone on line telling them our needs and this was the product that we were looking for...perfect match guys.. the boat is coming along great..standing up under water and still staying fexable... helps seal the screws perfect for what we needed
5/11/2009
5.0
Sikaflex 291
By RonV
from Milwaukee
About Me Recreational
Pros
Easy to Use
Protects Well
Visually Pleasing
Weather Proof
Cons
Best Uses
Outdoor
Comments about Sikaflex 291:
Very happy with application and performance...use mineral spirits to clean up.
12/1/2008
5.0
great product to work with
By captdean
from Maine
About Me Recreational
Pros
Easy to Use
Protects Well
Weather Proof
Cons
Best Uses
Comments about Sikaflex 291:
I use this product in making a rubber coating on packing rod to make artificial fishing lures and it can be painted different colors
3/10/2008
(3 of 4 customers found this review helpful)
4.0
Great value
By skiff builder
from Chesapeake VA
About Me Recreational
Pros
Easy to Use
Excellent hold
Low price
Protects Well
Visually Pleasing
Weather Proof
Cons
Best Uses
Indoor
Outdoor
Quick Fix
Seams of boat
Comments about Sikaflex 291:
Been building a boat for personal use. This product is much easier to use then resin and holds very well. THe wood pulls apart before the joint gives. Read great things about it on other builds. Allows more time to work. excess is easily cleaned up with a rag and putty knife after screwing joints together. I will definetly buy this for the next boat.
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If you find a lower delivered price on a new identical item in stock and available for purchase from an authorized U.S. merchant.
- email us at pricematch@jamestowndistributors.com. This offer does not include special coupons or other promotional offers.
Special order items are not stocked and are ordered direct from the manufacturer. They are non-returnable, may take 2-4 weeks, price and shipping charges subject to change.
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