---
product_id: 214989981
title: "Flex Paste Rubberized Waterproof Sealant Paste, Black, Cartridge, 1-Pack"
brand: "flex paste"
price: "R868"
currency: ZAR
in_stock: true
reviews_count: 13
url: https://www.desertcart.co.za/products/214989981-flex-paste-rubberized-waterproof-sealant-paste-black-cartridge-1-pack
store_origin: ZA
region: South Africa
---

# Fully paintable & UV resistant Waterproof & dries underwater 9 oz thick rubber paste Flex Paste Rubberized Waterproof Sealant Paste, Black, Cartridge, 1-Pack

**Brand:** flex paste
**Price:** R868
**Availability:** ✅ In Stock

## Summary

> 💪 Seal it. Paint it. Forget it. The ultimate fix-it flex for every pro millennial.

## Quick Answers

- **What is this?** Flex Paste Rubberized Waterproof Sealant Paste, Black, Cartridge, 1-Pack by flex paste
- **How much does it cost?** R868 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/214989981-flex-paste-rubberized-waterproof-sealant-paste-black-cartridge-1-pack)

## Best For

- flex paste enthusiasts

## Why This Product

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

## Key Features

- • **Seal Like a Pro:** Creates a flexible, watertight rubberized barrier that blocks air, water, and moisture.
- • **Custom Finish Ready:** Once cured, paint it any color to match your style while preventing rust and corrosion.
- • **Big Gaps? No Problem:** Super thick paste instantly fills large cracks, holes, and gaps with lasting adhesion.
- • **Stay Fresh Container:** Innovative airtight packaging locks in freshness to maximize product lifespan and minimize waste.
- • **Underwater Application:** Unique formula allows application and curing even underwater—no project too wet.

## Overview

Flex Paste is a 9 oz black rubberized putty designed for professional-grade sealing and repairs. Waterproof and UV resistant, it fills large gaps and cracks on diverse surfaces like drywall, concrete, and EPDM. Its unique formula allows application underwater and cures into a flexible, paintable barrier that blocks air, water, and moisture. Packaged in an airtight container to preserve freshness, it’s perfect for durable, clean, and customizable fixes on walls, roofs, RVs, and more.

## Description

Buy Flex Paste Rubberized Waterproof Sealant Paste, Black, Cartridge, 1-Pack | Super thick rubber paste, fills gaps, cracks, holes, works underwater, paintable, UV resistant, walls, drywall, roof, RV: Sealers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Great product! - Great product! Worked well when I needed to reattach a tile in my inground pool. Would recommend.
Review: Tough stuff! - I used this to patch together two pieces of EPDM pond lining. 3 months later it's working beautifully. I also used it to create a 4 inch high stone "wall" for the waterfall to spill over. That also worked very nicely. It does apply well under water [I tested that] but I initially applied it on completely dry lining and dry stones. Left it alone for 3 days just to be sure it cured and there was no disappointment. The only problem was the packaging. I used 2 containers and each was only half useable. The middle of the paste was pliable but somehow the outer rims of paste were too hardened to use. Basically, between the 2 containers, I was only able to use what amounted to 1 container. Other than that, I'll be using this paste again. It's very strong, really seals, and lives up to all the claims.

## Features

- NEW! STAY FRESH CONTAINER – Blocks out air and locks in freshness to extend the sealing power of Flex Paste, with no waste
- COAT, SEAL & PROTECT - Penetrates deep to seal out air, water, and moisture. Once dry, it turns into a strong, flexible, watertight, rubberized barrier
- WORKS UNDERWATER - Can be applied underwater, and it even dries underwater
- FILLS LARGE AREAS - Super thick rubber paste clings to the surface and instantly fills large gaps, cracks, and holes
- FULLY PAINTABLE - Once fully cured, it can be painted any color. Helps prevent rust and corrosion, and it is UV resistant

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B084TDD2FB |
| Best Sellers Rank | #14,309 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #61 in Hardware Sealers |
| Brand | Flex Paste |
| Brand Name | Flex Paste |
| Color | Black |
| Compatible Material | Wood, Glass, Tile, Concrete, Aluminum, Metal, Stucco, Masonry, Copper, Fabric, Fiberglass, Ceramic, Porcelain, Natural Stones, Roofing, Pvc, Eifs, Cspe, Epdm, Hypalon Polyurethanes |
| Customer Reviews | 4.0 out of 5 stars 6,067 Reviews |
| Included Components | Household Item |
| Item Dimensions | 11.25 x 3 x 3 inches |
| Item Form | Paste |
| Item Type Name | Flex Paste 9 Oz. Cartridge - Black |
| Item Weight | 9 ounces |
| Item dimensions L x W x H | 11.25 x 3 x 3 inches |
| Manufacturer | Swift Response, LLC |
| Material | Rubber |
| Material Type | Rubber |
| Model | FLEX SEAL - PFSBLKR10 - BLACK |
| Number of Items | 1 |
| Number of Packs | 1 |
| Part Number | PFSBLKR10 |
| Style | 9 oz Black |
| Style Name | 9 oz Black |
| Surface Recommendation | Windows,Doors |
| UPC | 850010226859 |
| Unit Count | 1 Ounce |
| Warranty Description | 1 Year Limited |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** Flex Paste
- **Item Weight:** 9 Ounces
- **Item dimensions L x W x H:** 11.25 x 3 x 3 inches
- **Material:** Rubber
- **Style:** 9 oz Black

## Images

![Flex Paste Rubberized Waterproof Sealant Paste, Black, Cartridge, 1-Pack - Image 1](https://m.media-amazon.com/images/I/51h83Yv5HdL.jpg)
![Flex Paste Rubberized Waterproof Sealant Paste, Black, Cartridge, 1-Pack - Image 2](https://m.media-amazon.com/images/I/71id8yOrn8L.jpg)
![Flex Paste Rubberized Waterproof Sealant Paste, Black, Cartridge, 1-Pack - Image 3](https://m.media-amazon.com/images/I/71yd+Gnyk+L.jpg)
![Flex Paste Rubberized Waterproof Sealant Paste, Black, Cartridge, 1-Pack - Image 4](https://m.media-amazon.com/images/I/71xvXuxwrIL.jpg)
![Flex Paste Rubberized Waterproof Sealant Paste, Black, Cartridge, 1-Pack - Image 5](https://m.media-amazon.com/images/I/71mAPcut5pL.jpg)

## Available Options

This product comes in different **Color, Size** options.

## Questions & Answers

**Q: Can I use it around the base of my toilet?**
A: You can! We recommend keeping it near the base of the toilet and not spreading it through the floor as it can become slippery when wet. Let us know how the project goes!

**Q: can flex glue be used to repair a roho inflatable neoprene wheelchair cushion?**
A: not sure, they make a tape like duct tape, that might work.  The paste is  more for sealing cracks.

**Q: can you paint after this is applied?**
A: Spray paint might eat the rubber away or anything else that has more of a solvent when you paint I wouldn’t use on this

**Q: Will it fix a hole puncture on a 8” subwoofer?**
A: Yes read my post about the puncture on my 2016 ford interceptor rear quarter panel worked like a champ on this damage from a corner of a shelf on the wall

## Customer Reviews

### ⭐⭐⭐⭐⭐ Great product!
*by G***. on August 21, 2026*

Great product! Worked well when I needed to reattach a tile in my inground pool. Would recommend.

### ⭐⭐⭐⭐⭐ Tough stuff!
*by C***E on October 4, 2024*

I used this to patch together two pieces of EPDM pond lining. 3 months later it's working beautifully. I also used it to create a 4 inch high stone "wall" for the waterfall to spill over. That also worked very nicely. It does apply well under water [I tested that] but I initially applied it on completely dry lining and dry stones. Left it alone for 3 days just to be sure it cured and there was no disappointment. The only problem was the packaging. I used 2 containers and each was only half useable. The middle of the paste was pliable but somehow the outer rims of paste were too hardened to use. Basically, between the 2 containers, I was only able to use what amounted to 1 container. Other than that, I'll be using this paste again. It's very strong, really seals, and lives up to all the claims.

### ⭐⭐⭐⭐ Works under any condition
*by B***N on September 16, 2024*

I want to rate this product lower because this is the second one I’ve bought that had a hard 2/3” top so 10-15% of it is trash. This product is also very hard to work with. This will not spread smooth and is very messy. This product will only patch a small area. I used the entire tub for this small patch over. However, I am rating this product a 4 star because there is not another product that I know of like it. This is the second time patching my rooftop tent due to the tent getting a crack in it. This product went on and cured in the very moist fog. It then rained and still cured. This product lasted through a very cold winter through heavy snow and some rain. This product took abuse from heavy 4x4ing and flexing. It wasn’t until it was well over 100f and with some flexing this product split. I bought this second tub to patch the crack.

## Frequently Bought Together

- Flex Paste, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs, Black, Cartridge
- Flex Seal 2-Pack Black 17oz Stop Leaks Instantly, Waterproof Sealant Coating For Gutters, RV, Roof, Skylights, Windows
- Flex Paste, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs, Black, Half-Quart

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**Shop now:** [https://www.desertcart.co.za/products/214989981-flex-paste-rubberized-waterproof-sealant-paste-black-cartridge-1-pack](https://www.desertcart.co.za/products/214989981-flex-paste-rubberized-waterproof-sealant-paste-black-cartridge-1-pack)

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-09-01*