---
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: "$33.31"
currency: USD
in_stock: true
reviews_count: 13
category: "Sika"
url: https://www.desertcart.us/products/17949646-sikaflex-291-black-fast-cure-marine-adhesive-and-sealant-polyurethane
store_origin: US
region: United States of America
---

# High water & salt resistance Marine-grade polyurethane 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:** $33.31
**Availability:** ✅ In Stock

## Summary

> 🚤 Seal the deal with speed and strength on every wave!

## 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?** $33.31 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/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

- • **Paint-Ready Finish:** Sands smooth and accepts paint for a flawless, professional look.
- • **Unmatched Water Defense:** Engineered to resist fresh and saltwater damage, ensuring long-lasting seals.
- • **User-Friendly Cartridge:** Compatible with manual, pneumatic, and electric guns for precise application.
- • **Fast-Track Marine Repairs:** Starts curing immediately on moisture exposure for rapid project turnaround.
- • **Flexible & Vibration-Resistant:** Elastic formula absorbs boat movement and vibrations without cracking.

## Overview

SIKA Sikaflex-291 is a black, one-component polyurethane marine adhesive and sealant designed for fast curing and durable, waterproof bonds. Ideal for boats, it resists water, fuels, and oils while providing elastic, vibration-resistant seals that can be sanded and painted. Packaged in a 10.1 fl. oz cartridge compatible with various caulking guns, it meets international maritime standards for professional marine construction and repair.

## 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 | #4,601 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #5 in Polyurethane Adhesives |
| Brand | SIKA |
| Color | Black |
| Date First Available | April 19, 2013 |
| Full Cure Time | 24 Hours |
| Global Trade Identification Number | 00033886005272 |
| Is Discontinued By Manufacturer | No |
| Item Form | Paste |
| Item Package Quantity | 1 |
| Item Volume | 10.1 Fluid Ounces |
| Item Weight | 10.1 ounces |
| Item model number | 90923 |
| Manufacturer | Sika USA |
| Material | 1-C polyurethane |
| Number of Pieces | 1 |
| Package Information | Cartridge |
| Product Dimensions | 11.5 x 2 x 11.5 inches |
| Special Feature | Water Resistant |
| Specific Uses For Product | Marine |
| UPC | 033886005272 |
| Unit Count | 10.1 Fluid Ounces |
| Viscosity | High Viscosity Paste |
| Viscosity Level | High |
| 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)

## 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.

### ⭐⭐⭐⭐⭐ Great price
*by M***O on March 6, 2026*

Works the way it should.

## 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 United States of America*
*Store origin: US*
*Last updated: 2026-03-22*