---
product_id: 17949646
title: "Sikaflex-291, Black, Fast Cure Marine Adhesive and Sealant, Polyurethane for Boats, Waterproof, Paintable, 10.1 fl. oz Cartridge"
brand: "sika"
price: "VT7335"
currency: VUV
in_stock: true
reviews_count: 13
category: "Sika"
url: https://www.desertcart.vu/products/17949646-sikaflex-291-black-fast-cure-marine-adhesive-and-sealant-polyurethane
store_origin: VU
region: Vanuatu
---

# Marine-grade polyurethane High water & salt resistance Cures skin in ~60 mins Sikaflex-291, Black, Fast Cure Marine Adhesive and Sealant, Polyurethane for Boats, Waterproof, Paintable, 10.1 fl. oz Cartridge

**Brand:** sika
**Price:** VT7335
**Availability:** ✅ In Stock

## Summary

> ⚓ Seal the deal with marine-grade speed and strength!

## Quick Answers

- **What is this?** Sikaflex-291, Black, Fast Cure Marine Adhesive and Sealant, Polyurethane for Boats, Waterproof, Paintable, 10.1 fl. oz Cartridge by sika
- **How much does it cost?** VT7335 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/17949646-sikaflex-291-black-fast-cure-marine-adhesive-and-sealant-polyurethane)

## Best For

- sika enthusiasts

## Why This Product

- Trusted sika brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Fast-Track Your Fixes:** Starts curing immediately on moisture exposure for rapid project turnaround.
- • **Effortless Application:** Compatible with manual, pneumatic, and electric caulking guns for precise, mess-free use.
- • **Built for the Brutal Seas:** Engineered to resist fresh and saltwater damage, keeping your vessel sealed and secure.
- • **Paint-Ready Professional Finish:** Sandable and paintable for seamless integration with your boat’s aesthetics.
- • **Elastic Strength Meets Vibration Resistance:** Maintains flexible, durable bonds that absorb movement without cracking.

## Overview

SIKA Sikaflex-291 is a black, one-component polyurethane marine adhesive and sealant designed for fast curing and superior water resistance. Ideal for boats, it forms elastic, vibration-resistant joints that withstand fresh and saltwater exposure. Compatible with various substrates including wood, metal, and plastics, it offers a paintable finish and easy application via standard caulking guns. Certified to meet International Maritime Organization and ISO standards, it ensures durable, professional-grade sealing for marine construction and repairs.

## Description

For secure seals in a marine environment that won't degrade due to water exposure, Sikaflex-291 adhesive and sealant offers an optimal solution. It's an all-purpose sealant that creates strong, stable bonds to a wide range of common marine construction surfaces, including wood, metal, ceramic materials, plastics, and metal primers and paint coatings. It's ideal for elastic and vibration-resistant joint seals or for a range of interior applications. Once applied, the sealant can be sanded and finished with paint for a truly professional sheen. Satisfies the International Maritime Organization standards and ISO 9001 / 14001.

Review: Holds well, good gap filler. - Used this to fill the seam between the hull and deck. Used an electric calking gun allowing for controlled flow into the seams which were 22ft runs from stern to bow. took two tubes of Silkaflex. While fresh it was easy to use a scraper to push this material deeper into the seam and simple to remove excess leaving a smooth seam level with the deck. It took several days to harden to my satisfaction and in the meantime collected a layer of dust onto its surface. Once painted there is a subtle but clear discoloration showing through the paint. It's a good product but as this was a restoration job on a classic wooden boat I think epoxy would have been a better choice. But, no complaints with how this material works and I'm sure it will hold up for some time as the hull and deck flex a bit with movement and with the natural swelling and shrinking inherent in wood.
Review: Silkaflex Boat, RV, General use. - This is really good RTV! I didn't know Silksflex existed until I had to change out a pair of jet drives on a Zodiac Hurricane. Silksflex RTV was the recommended by the OEM manufacturer. I use Silkaflex on Motorhomes, trucks and around my house. Very strong and flexible and seawater resistant.

## Features

- THE CHOICE FOR BOATS — Formulated for use in marine construction, this one-component polyurethane adhesive creates a strong, elastic, and vibration-resistant joint seal
- CURES QUICKLY FOR FAST JOBS — Begins to cure immediately upon exposure to atmospheric moisture and develops a skin within approximately 60 minutes, depending on environmental factors such as humidity
- HIGH RESISTANCE TO WATER DAMAGE — Whether fresh or salt water, this Sikaflex marine sealant resists damage and maintains peak performance. It's also resistant for limited periods to fuels and oils
- DURABLE AND NON-CORROSIVE — Sika-291 marine sealant and adhesive won't wear away due to exposure to the elements or to most diluted acids or caustic solutions. Enjoy long-lasting performance
- QUICK AND EASY — Sikaflex-291 comes in a conveniently-sized cartridge that connects to manual, pneumatic, and electric-driven piston guns. Simply point it where you want it to go

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00C501KD4 |
| Best Sellers Rank | #5,404 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #12 in Polyurethane Adhesives |
| Brand | SIKA |
| Brand Name | SIKA |
| Color | Black |
| Compatible Material | Aluminum |
| Container Type | Cartridge |
| Customer Reviews | 4.5 out of 5 stars 1,257 Reviews |
| Full Cure Time | 24 Hours |
| Global Trade Identification Number | 00033886005272 |
| Included Components | Sealant |
| Item Form | Paste |
| Item Package Quantity | 1 |
| Item Type Name | Adhesive |
| Item Weight | 10.1 Ounces |
| Manufacturer | Sika USA |
| Material | 1-C polyurethane |
| Material Type | 1-C polyurethane |
| Model | 90923 |
| Number of Pieces | 1 |
| Other Special Features of the Product | Water Resistant |
| Part Number | 017-90923 |
| Special Feature | Water Resistant |
| Specific Uses For Product | Marine |
| UPC | 033886005272 |
| Unit Count | 10.1 Fluid Ounces |
| Viscosity Level | High |
| Volume | 10.1 Fluid Ounces |
| Water Resistance Level | Water Resistant |

## Product Details

- **Brand:** SIKA
- **Item Form:** Paste
- **Material:** 1-C polyurethane
- **Special Feature:** Water Resistant
- **Specific Uses For Product:** Marine

## Images

![Sikaflex-291, Black, Fast Cure Marine Adhesive and Sealant, Polyurethane for Boats, Waterproof, Paintable, 10.1 fl. oz Cartridge - Image 1](https://m.media-amazon.com/images/I/71EkVlxGSIL.jpg)
![Sikaflex-291, Black, Fast Cure Marine Adhesive and Sealant, Polyurethane for Boats, Waterproof, Paintable, 10.1 fl. oz Cartridge - Image 2](https://m.media-amazon.com/images/I/8119qzS3FNL.jpg)
![Sikaflex-291, Black, Fast Cure Marine Adhesive and Sealant, Polyurethane for Boats, Waterproof, Paintable, 10.1 fl. oz Cartridge - Image 3](https://m.media-amazon.com/images/I/81yB3UQu86L.jpg)
![Sikaflex-291, Black, Fast Cure Marine Adhesive and Sealant, Polyurethane for Boats, Waterproof, Paintable, 10.1 fl. oz Cartridge - Image 4](https://m.media-amazon.com/images/I/71MXUK2nQNL.jpg)
![Sikaflex-291, Black, Fast Cure Marine Adhesive and Sealant, Polyurethane for Boats, Waterproof, Paintable, 10.1 fl. oz Cartridge - Image 5](https://m.media-amazon.com/images/I/81zrwecanhL.jpg)

## Available Options

This product comes in different **Color, Size, Number Of Items** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Holds well, good gap filler.
*by J***F on July 21, 2024*

Used this to fill the seam between the hull and deck. Used an electric calking gun allowing for controlled flow into the seams which were 22ft runs from stern to bow. took two tubes of Silkaflex. While fresh it was easy to use a scraper to push this material deeper into the seam and simple to remove excess leaving a smooth seam level with the deck. It took several days to harden to my satisfaction and in the meantime collected a layer of dust onto its surface. Once painted there is a subtle but clear discoloration showing through the paint. It's a good product but as this was a restoration job on a classic wooden boat I think epoxy would have been a better choice. But, no complaints with how this material works and I'm sure it will hold up for some time as the hull and deck flex a bit with movement and with the natural swelling and shrinking inherent in wood.

### ⭐⭐⭐⭐⭐ Silkaflex Boat, RV, General use.
*by D***T on October 28, 2025*

This is really good RTV! I didn't know Silksflex existed until I had to change out a pair of jet drives on a Zodiac Hurricane. Silksflex RTV was the recommended by the OEM manufacturer. I use Silkaflex on Motorhomes, trucks and around my house. Very strong and flexible and seawater resistant.

### ⭐⭐⭐⭐⭐ I like the color
*by R***W on March 16, 2026*

Each type of caulk has its own purpose and this is not structural quite obviously. I like the fact that It can be above or below the waterline but I would not ever use this below the waterline. As I suspected there are better ways; that said knowing that they don't have a problem with it being underwater makes me feel a lot better about it being above water on my deck. Acting as a sealant.

## Frequently Bought Together

- Sikaflex-291, Black, General All-Purpose Fast Cure Marine Adhesive and sealant. Polyurethane sealant for Boats, 10.1 fl. oz Cartridge
- Sika Sikaflex-291 LOT - General All-Purpose Adhesive and sealant, Black - Marine Use - Elastic and Non-Corrosive - 10.1 fl. oz.

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-05-19*