Does the black caulk dry to a gloss, or is it more matte finish, like a dull rubber?

it still retains a dark matte color I would not say dull, but not a gloss finish

Will it bond to bare aluminum to seal around the rivets?

Yes, I used it to seal my roof fans on my Sprinter. It adhered to painted metal (scored the paint), wood framing of the opening, plastic shroud and aluminum pressure plates. I am extremely satisfied with this product and from the day installed, it shows no wear even after a year. Excellent product... Another really good product is 3m 4200 Marine Adhesive...

Will this bond to rubber?

Not sure about rubber, but everything else I happened to get it on and let dry it stuck like paint. My clothes, stainless railings, fiberglass cabin, teak of course, cork fishing rod handle, my leather wallet. . .

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Sikaflex-291, White, General All-Purpose Fast Cure Marine Adhesive and sealant. Polyurethane sealant for Boats, 10.1 fl. oz Cartridge (Pack of 1)

Sikaflex-291, White, General All-Purpose Fast Cure Marine Adhesive and sealant. Polyurethane sealant for Boats, 10.1 fl. oz Cartridge (Pack of 1)

Product ID: 84441952

Details

Brand
SIKA
Item Form
Gel
Material
1-C
Special Feature
Fast Curing
Specific Uses For Product
Boating

💧Water & chemical resistant - durable in harsh environments

⏱️Fast cure time - rapid project turnaround

🛥️Marine-grade adhesion - trusted by boat builders

€ 40.26

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Description

🛠️ Seal the deal fast — marine-grade strength that won’t let you down!

SPEED MEETS STRENGTH - Fast tack-free cure accelerates your marine repairs without compromising bond integrity.
BUILT FOR THE ELEMENTS - Superior resistance to fresh & sea water, fuels, oils, and caustics ensures long-lasting seals.
VERSATILE COMPATIBILITY - Adheres flawlessly to fiberglass, gelcoat, metal, and wood for multi-surface applications.
PROFESSIONAL GRADE ASSURANCE - NSF & USDA approvals guarantee safety for incidental food contact and potable water use.
ABOVE BELOW WATERLINE PERFORMANCE - Reliable elasticity and vibration resistance keep seals intact in dynamic marine environments.

Sikaflex-291 is a premium fast-curing polyurethane adhesive and sealant designed for demanding marine applications. Trusted by professional boat builders, it bonds securely to fiberglass, metal, wood, and gelcoat, offering exceptional durability against water, chemicals, and vibration. NSF and USDA approvals make it safe for incidental food contact and potable water systems, making it the go-to sealant for above and below waterline repairs and maintenance.

Specifications

ASIN	B01GPIXX5Y
Best Sellers Rank	#7,362 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #48 in Silicone Adhesives #55 in Adhesive Caulk #115 in Industrial Sealants
Brand Name	SIKA
Color	White
Compatible Material	Fiberglass, Metal, Wood
Container Type	Cartridge
Customer Reviews	4.6 4.6 out of 5 stars (1,342)
Included Components	10.1 fl oz Cartridge
Item Form	Gel
Item Package Quantity	1
Item Type Name	Adhesive
Item Weight	300 g
Manufacturer	Sika USA
Material Type	1-C polyurethane
Model	90919
Number of Pieces	1
Other Special Features of the Product	Fast Curing
Part Number	90919
Specific Uses For Product	Boating
Tensile Strength	260 kips_per_square_inch
UPC	033886005258
Unit Count	10.1 Fluid Ounces
Viscosity Level	Medium
Volume	10.1 fluid ounces
Water Resistance Level	Water Resistant

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€ 40.26

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Greece.

Secure transaction

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