Will this work to repair cracks in my pool skimmer? Is it elastic or hard like epoxy when cured?

It is elastomeric and should work well for that I would think. I used it to seal the roof seams on a 2015 GMC pickup and it worked great. Keep in mind it is self leveling so it spreads out a bit on its own.

Would this work for adhering rubber matting to a wooden and aluminum boat deck?

yes, it would work. A permanent solution would be 3M 5200 sealant. Try a small piece first!

can i use this to attach solar panels to camper roof? pnls weigh 24pnds.

I used mine for water proofing sealant while glueing down a metal flang which weighed very little. Not sure about the solar panels

Would this work in a swimming pool. I have a concrete pool that has plexiglass windows in the sides below the water level.

I believe so, we use it on the seams of our water slide that's underwater at all times.

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SIKA Sikaflex-291 LOT Black, All-Purpose Marine Adhesive & Sealant, Elastic & Non-Corrosive - 10.1 fl. oz - Ideal for Wood, Fiberglass, Metal, Fresh & Saltwater Applications

SIKA Sikaflex-291 LOT Black, All-Purpose Marine Adhesive & Sealant, Elastic & Non-Corrosive - 10.1 fl. oz - Ideal for Wood, Fiberglass, Metal, Fresh & Saltwater Applications

Product ID: 26693033

Details

Brand
SIKA
Item Form
Paste
Material
1-C
Special Feature
Water
Specific Uses For Product
Marine

⚡High elasticity & vibration resistance

🌊Marine-grade water resistance

🛠️One-component easy application

€ 28.91

Duties & taxes included

In stock

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Description

⚓ Seal your marine projects with confidence—because your boat deserves the best!

PAINT SAND READY - Cures to a stable finish that can be painted or sanded without compromising strength.
EFFORTLESS APPLICATION - One-component polyurethane paste fits all piston guns—no mess, no fuss.
CHEMICAL FUEL RESISTANT - Resists diluted acids, caustics, fuels, oils, and fats—built for harsh marine conditions.
DURABILITY MEETS FLEXIBILITY - Highly elastic, vibration-resistant sealant that withstands fresh & saltwater environments.
ULTIMATE MARINE BONDING POWER - Adheres flawlessly to wood, fiberglass, and metal for above & below waterline use.

SIKA Sikaflex-291 LOT is a premium black, one-component polyurethane marine adhesive and sealant designed for wood, fiberglass, and metal surfaces. It offers exceptional elasticity, water resistance (fresh and salt), and chemical durability, curing fully in 24 hours with a paintable, sandable finish. Ideal for professional marine applications requiring strong, vibration-resistant seals both above and below the waterline.

Specifications

ASIN	B00C50GIQI
Best Sellers Rank	#26,662 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #15 in Polyurethane Adhesives #57 in Urethane Adhesives
Brand Name	SIKA
Color	Black
Compatible Material	Fiberglass, Metal, Wood
Container Type	Cartridge
Customer Reviews	4.6 4.6 out of 5 stars (365)
Full Cure Time	24 hours
Included Components	Sealant
Item Form	Paste
Item Package Quantity	1
Item Type Name	Adhesive
Item Weight	10.1 ounces
Manufacturer	Sika USA
Material Type	1-C polyurethane
Model	90927
Number of Pieces	1
Other Special Features of the Product	Water Resistant
Part Number	90927
Specific Uses For Product	Marine, Underwater
UPC	033886005289
Unit Count	10.1 Fluid Ounces
Viscosity Level	Medium to High
Volume	10.1 fluid ounces
Warranty Description	Warranty
Water Resistance Level	Water Resistant

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