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. . .

Marine Sealant And Adhesive | Desertcart South Africa

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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R676

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Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🛠️ Seal the deal with speed and strength—your boat’s best defense against the elements!

VERSATILE APPLICATION - Squeeze or brush on easily, paintable finish for seamless integration with your vessel’s aesthetics.
RAPID CURE READY TO GO - Get your marine projects sealed and secured in record time with fast tack-free technology.
CERTIFIED SAFE RELIABLE - NSF approved for drinkable water and USDA approved for incidental food contact—marine safety meets peace of mind.
UNMATCHED MARINE ADHESION - Bonds flawlessly to gelcoat, fiberglass, metal, and wood—trusted by professional boat builders.
DURABILITY THAT DEFIES ELEMENTS - Resistant to fresh & sea water, acids, fuels, and oils for long-lasting protection above and below waterline.

Sikaflex®-291 is a professional-grade marine sealant and adhesive offering fast curing, exceptional elasticity, and superior adhesion to multiple materials including fiberglass, metal, and wood. Engineered for durability against water, chemicals, and fuels, it performs reliably above and below the waterline. NSF and USDA approvals ensure safety for potable water and incidental food contact, making it the go-to choice for boat builders and marine maintenance experts.

Specifications

ASIN	B01GPIXX5Y
Best Sellers Rank	#6,890 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #40 in Silicone Adhesives #61 in Adhesive Caulk #118 in Industrial Sealants
Brand Name	SIKA
Color	White
Compatible Material	Fiberglass, Metal, Wood
Container Type	Cartridge
Customer Reviews	4.5 4.5 out of 5 stars (1,288)
Included Components	10.1 fl oz Cartridge
Item Form	Gel
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
Other Special Features of the Product	Fast Curing
Part Number	90919
Specific Uses For Product	Boating
Tensile Strength	260 Kips Per Square Inch
UPC	033886005258
Unit Count	10.1 Fluid Ounces
Viscosity Level	Medium
Volume	10.1 Fluid Ounces
Water Resistance Level	Water Resistant

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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.

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R676

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Marine Sealant & Adhesive

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