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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Marine Sealant & Adhesive

Product ID: 84441952

Details

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

🌊Resistant to fresh & sea water, acids, oils & fuels

⏱️Fast cure time under 24 hours

🛥️Superior adhesion to gelcoat, fiberglass, metal & wood

€ 37.51

Duties & taxes included

In stock

Sold byAmazon NetherlandsDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Seal the deal with speed and strength—your boat’s best kept secret!

RAPID CURE READY TO GO - Get your marine projects sealed and sailing faster with a tack-free time that beats the clock.
UNIVERSAL BONDING POWER - Seamlessly adheres to gelcoat, fiberglass, metal, and wood for versatile marine applications.
BUILT TO BRAVE THE ELEMENTS - Engineered to resist fresh water, sea water, acids, oils, and even sewage effluent for unmatched durability.
CERTIFIED SAFE FOR CRITICAL USE - NSF and USDA approvals mean it’s safe for drinkable water systems and incidental food contact—trust where it counts.
ABOVE BELOW WATERLINE CONFIDENCE - Reliable performance whether exposed to air or submerged, ensuring long-lasting seals.

Sikaflex®-291 is a professional-grade marine sealant and adhesive offering fast curing, exceptional elasticity, and superior adhesion to multiple substrates including gelcoat, fiberglass, metal, and wood. Resistant to a wide range of harsh marine environments and certified safe for potable water and incidental food contact, it delivers durable, vibration-resistant seals above and below the waterline, making it the go-to choice for boat builders and marine maintenance experts.

Specifications

ASIN	B01GPIXX5Y
Best Sellers Rank	#6,298 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #36 in Silicone Adhesives #61 in Adhesive Caulk #114 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 (1,328)
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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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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