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 fast, stay strong — the ultimate marine adhesive for pros who don’t wait.

SLEEK STEALTHY - Black polyurethane finish blends seamlessly with boat surfaces for a clean, professional look.
SPEED MEETS STRENGTH - Fast curing formula accelerates your project timeline without compromising durability.
QUALITY YOU CAN TRUST - Manufactured under ISO 9001/14001 standards for consistent, professional-grade results.
VERSATILE APPLICATION - Perfect for sealing thru-hull fittings, hardware, and underwater repairs.
MARINE GRADE RELIABILITY - Engineered specifically for harsh saltwater environments to ensure lasting performance.

Sika Sikaflex 291 Fast Cure is a 3-ounce, 1-component polyurethane marine sealant designed for rapid curing and superior adhesion. Ideal for above and below water applications, it resists saltwater corrosion and adheres excellently to gelcoat and hardware, making it a trusted choice for boat builders and marine professionals seeking fast, durable sealing solutions.

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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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Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

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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.

KD 21.58

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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
Colour	Black
Material	Polyurethane
Item Package Quantity	1
Number of Pieces	1
Special Features	Fast Curing
Specific uses	Marine, Boat
Batteries included?	No
Batteries Required?	No

SIKA Sikaflex 291 Fast Cure Black 3 Ounces Tube - 610566

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