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

Product ID: 265602460

Details

Brand
SIKA
Item form
Paste
Material
1-C
Special features
Fast Cure
Specific uses for product
Boating

⚓Marine-grade adhesion

💧Water & chemical resistant

⏱️Fast cure time

S$54

Duties & taxes included

In stock

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Description

⚓ Seal the deal fast, stay afloat longer!

RAPID SEAL MASTERY - Fast tack-free cure accelerates your project timeline without compromising strength.
ALL WEATHER WARRIOR - Resistant to fresh & sea water, acids, oils, and more—built to withstand harsh marine environments.
MARINE GRADE BONDING - Superior adhesion to gelcoat, fiberglass, metal, and wood ensures lasting durability on all boat surfaces.
VERSATILE APPLICATION - Can be brushed or squeezed into place, perfect for above and below waterline sealing needs.
CERTIFIED SAFE RELIABLE - NSF & USDA approved for incidental food contact and drinkable water systems—trusted by pros.

Sikaflex-291 is a professional-grade, fast-curing polyurethane marine adhesive and sealant designed for superior elasticity and vibration resistance. Ideal for boats and marine construction, it bonds strongly to multiple surfaces and withstands harsh water and chemical exposure, making it a trusted choice for durable, long-lasting seals above and below the waterline.

Specifications

ASIN	B01GPIXX5Y
Best Sellers Rank	#109,141 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #705 in Hardware Sealers
Brand Name	SIKA
Color	White
Compatible Material	Metal
Container Type	Cartridge
Customer Reviews	4.5 4.5 out of 5 stars (1,202)
Included Components	Sealant
Item Form	Paste
Item Package Quantity	1
Item Type Name	Adhesive
Item Weight	300 Grams
Manufacturer	Sika USA
Material Type	1-C polyurethane
Model	90919
Number of Packs	1
Number of Pieces	1
Other Special Features of the Product	Fast Cure
Part Number	90919
Specific Uses For Product	Boating
Tensile Strength	260 Kips Per Square Inch
UPC	033886005258
Unit Count	298.69 Milliliters
Viscosity Level	Medium
Volume	10.1 Fluid Ounces
Water Resistance Level	Water Resistant

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