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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⚡ Seal it fast, seal it right – the pro’s choice for marine-grade strength!

WEATHERPROOF SEAL - Withstands harsh marine environments for long-lasting protection.
COMPACT EFFICIENT - 300 ml cartridge designed for easy handling and precise application.
RAPID BONDING POWER - Cures quickly to keep your projects moving at lightning speed.
MARINE GRADE TOUGHNESS - Trusted by boat builders for superior water resistance and flexibility.
ONE COMPONENT SIMPLICITY - No mixing required—just apply and seal with confidence.

Sikaflex 291 Fast Cure is a 1-component, moisture-curing polyurethane adhesive and sealant designed for marine applications. Its fast curing time and durable, flexible bond make it ideal for professionals needing quick, reliable sealing in demanding environments.

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Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Brand	SIKA
Model Number	90919
Product Dimensions	29.21 x 5.08 x 29.21 cm; 300 g
Color	white
Name List for Name Plates	Compact
Material	該当なし
Laser Class	速乾性
Included Components	10 fluid ounce cartridge
Are Batteries Included	No
Item Weight	300 g

Sika Sikaflex 291 Fast Cure White 10.3 Oz. 300 Ml

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