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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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
Colour
White
Item form
Paste
Item package quantity
1
Material
1-C

⚓Fast cure time

💧Water resistant

🔧Versatile applications

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43173CFA

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Sold byAmazon SenegalDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚤 Seal the Deal with Sikaflex!

PROFESSIONAL GRADE - NSF and USDA approved, making it safe for incidental food contact and drinkable water.
SPEED MEETS STRENGTH - Experience rapid bonding with a fast cure time, perfect for urgent repairs.
UNMATCHED DURABILITY - Resistant to a variety of harsh conditions, from seawater to caustic solutions.
USER FRIENDLY DESIGN - Easily applied by squeezing or brushing, with excellent paintability for seamless finishes.
VERSATILE APPLICATION - Ideal for both above and below the waterline, ensuring a strong hold wherever needed.

Sikaflex-291 is a high-performance polyurethane adhesive and sealant designed for marine applications. With a fast cure time and exceptional adhesion to various materials, it is perfect for both professional boat builders and DIY enthusiasts. This versatile sealant is resistant to water, chemicals, and extreme conditions, making it a reliable choice for any marine project.

Specifications

ASIN	B01GPIXX5Y
Best Sellers Rank	#135,425 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #713 in Hardware Sealers
Brand Name	SIKA
Color	White
Compatible Material	Metal
Container Type	Cartridge
Customer Reviews	4.4 4.4 out of 5 stars (633)
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 Pieces	1
Part Number	90919
UPC	033886005258
Unit Count	298.69 Milliliters
Volume	10.1 Fluid Ounces
Water Resistance Level	Water Resistant

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