Will this dry solid or is it flexible once dry?

its fairly solid - if you press on it it has the flex of the rubber tread on a car tyre

Would it be good for rubber seal on car doors

It is a permanent waterproof sealant, seems to be for total immersion, not sure it would be the right thing, Sika-Sikaflex do other automotive sealants/adhesives that might also work.

Would this seal a car windscreen and sunroof? Water leaking into car.

Yes it will do the job but is an adhesive as well as a sealant, there are other sealants for that purpose, Sikaflex goes off quickly so more difficult to work with and once you use some the remainder goes off, unless you seal it off well, I would look for a windscreen sealant, this is used mostly for glueing on panels..

I have a wooden hot tub and want to seal the inside joint between the sides and base. Is this suitable.

Hi Mike, If the joint will be permanently immersed then I'm sorry It's not suitable. Very few single part products are. If , on the other hand it's not for underwater, it will work perfectly. Hope that helps.

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

Help Track order

Account Cart

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

Help Track order

Account Cart

Sikaflex 291i Black Multi-Functional Adhesive Sealant for Marine Application - Black

Sikaflex 291i Black Multi-Functional Adhesive Sealant for Marine Application - Black

Product ID: 47904794

Details

Brand
Sika
Item dimensions L x W x H
48 x 48 x 230
Item weight
0.4 Kilograms
Material
Polyurethane
Style
Cartridge

⚓Marine-grade waterproof sealant

🖤Sleek black finish for seamless bonding

⏱️Fast curing for quick fixes

S$43

Duties & taxes included

In stock

Sold byAmazon SINGAPOREDelivered 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 SINGAPORE.

Secure transaction

ProDesertcart PRO

Fast, free shipping, member pricing & priority support.

Join PRO →

Description

⚓ Seal it like a pro — don’t let your boat miss out!

RAPID SEAL BOND - Fast curing adhesive that ensures quick, clean, and durable repairs.
SLEEK BLACK FINISH - Blends perfectly with dark surfaces for a professional, invisible seal.
TRUSTED SWISS QUALITY - Manufactured in Switzerland with a 4.6-star rating from over 3,400 users.
VERSATILE APPLICATION - Ideal for doors, tiles, windows, and all your boat maintenance needs.
ULTIMATE MARINE PROTECTION - Waterproof polyurethane formula designed to withstand harsh marine environments.

Sikaflex 291i Black is a high-performance, waterproof polyurethane adhesive sealant engineered for marine applications. It offers fast curing, strong bonding, and a sleek black finish that blends seamlessly on various surfaces including doors, tiles, and windows. Manufactured in Switzerland, this 300ml cartridge is trusted by thousands for durable, professional-grade repairs in demanding environments.

Specifications

ASIN	B004ZF8L0M
Best Sellers Rank	44,767 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 68 in Boat Maintenance Supplies
Brand	Sika
Colour	Black
Compatible Material	Polyurethane
Country Of Origin	Switzerland
Customer Reviews	4.6 4.6 out of 5 stars (3,497)
Global Trade Identification Number	07612894815047
Included Components	1 cartridge
Item Dimensions	48 x 48 x 230 millimetres
Item Form	Paste
Item Type Name	Sikaflex 291i Black Multifunctional adhesive sealant for marine applications
Item Weight	0.4 Kilograms
Manufacturer	Sikaflex
Manufacturer Part Number	291i Black
Material	Polyurethane
Model Number	291i
Number of Items	1
Number of Packs	1
Product Warranty	Product guarantees 0 months.
Style Name	Cartridge
Surface Recommendation	Door, Tile, Window
Unit Count	300.0 millilitre
Water Resistance Level	Waterproof

Common Questions

Are the products genuine and authentic?+

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.

How long does delivery take and is it reliable?+

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.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

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.

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

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.