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 smart — don’t let your projects wait!

SLEEK BLACK SEAL - Professional-grade black color blends seamlessly with your toughest jobs.
COMPACT POWER PACK - 3-ounce tube delivers just the right amount of high-performance adhesive.
NO BATTERIES NO HASSLE - Ready to use instantly—no extra gear or power needed.
RAPID STRENGTH ZERO WAIT - Cures quickly to get your projects moving faster than ever.
TRUSTED BRAND RELIABILITY - From Sika, a global leader in construction adhesives, ensuring quality you can count on.

Sika Sikaflex 291 Fast Cure Black is a 3-ounce tube of professional-grade, fast-curing adhesive and sealant. Designed for quick bonding with a sleek black finish, it offers durable performance without the need for batteries or additional tools, making it ideal for efficient, high-quality repairs and installations.

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TrustScore 4.5 | 7,300+ reviews

Ali H.

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

1 day ago

Anjali K.

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

1 month ago

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ali H.

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

1 day ago

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

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Manufacturer	Sika
Part number	610566
Item Weight	45.4 g
Package Dimensions	22 x 13.21 x 3 cm; 45.36 g
Item model number	610566
Item Package Quantity	1
Batteries included?	No
Batteries Required?	No

SikaSikaflex 291 Fast Cure Black 3 Ounces Tube - 610566

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