---
product_id: 214989981
title: "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"
brand: "flex paste"
price: "25071CFA"
currency: XOF
in_stock: true
reviews_count: 13
category: "Flex Paste"
url: https://www.desertcart.sn/products/214989981-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks-holes-block
store_origin: SN
region: Senegal
---

# Fully paintable & UV resistant Waterproof & dries underwater 9 oz cartridge for precise application 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

**Brand:** flex paste
**Price:** 25071CFA
**Availability:** ✅ In Stock

## Summary

> 💪 Seal it, paint it, forget it — Flex Paste has your repairs covered!

## Quick Answers

- **What is this?** 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 by flex paste
- **How much does it cost?** 25071CFA with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/214989981-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks-holes-block)

## 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

- • **Big Gap Filler:** Super thick paste instantly fills large cracks, holes, and gaps with lasting adhesion.
- • **Custom Finish Ready:** Paintable once cured, blending seamlessly with your walls, roofs, or RV surfaces.
- • **Seal with Confidence:** Creates a flexible, watertight rubberized barrier that blocks air, water, and moisture.
- • **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 premium 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 including drywall, concrete, EPDM, and more. Its unique formula allows application underwater and cures into a flexible, paintable barrier that blocks air, water, and moisture, making it ideal for walls, roofs, RVs, and outdoor fixtures. Packaged in an airtight container to preserve freshness and extend usability, Flex Paste delivers durable, leak-proof results trusted by thousands.

## Description

Buy 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: Sealers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Perfect water sealant with no leaks on cracked items - I had an outdoor water fountain that I forgot had water in it and it froze.... Which made the whole fixture crack at the water expanded. I use this flex paint to see if it would be able to seal the cracks and hold the water and it did!!! No more leaks and i the adhesion holds really really well. Drives fairly quickly like maybe 24 hours. The smell is a little strong so I would let it sit outside as it dries.
Review: Good purchase - This is great as long as you know its a one use product for whatever your project may be. You can't seal the container up adequately enough to prevent it from drying out. I would encourage you to purchase multiple small packages rather than one large one if you have multiple projects or just resign yourself to a lot of product loss. I personally used it to coat the ends of peg style towel holders so towels would stop slipping off the slick ends and into the floor. Worked, and I didn't have to remove old hardware and purchase new ones. That's a win.

## 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 | #14,925 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #55 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 6,022 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 |
| Part Number | PFSBLKR10 |
| Style | 9 oz Black |
| Style Name | 9 oz Black |
| Surface Recommendation | Windows,Doors |
| UPC | 850010226859 |
| Unit Count | 1.0 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

![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 - Image 1](https://m.media-amazon.com/images/I/51h83Yv5HdL.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

### ⭐⭐⭐⭐⭐ Perfect water sealant with no leaks on cracked items
*by F***S on December 13, 2025*

I had an outdoor water fountain that I forgot had water in it and it froze.... Which made the whole fixture crack at the water expanded. I use this flex paint to see if it would be able to seal the cracks and hold the water and it did!!! No more leaks and i the adhesion holds really really well. Drives fairly quickly like maybe 24 hours. The smell is a little strong so I would let it sit outside as it dries.

### ⭐⭐⭐⭐⭐ Good purchase
*by M***A on June 17, 2026*

This is great as long as you know its a one use product for whatever your project may be. You can't seal the container up adequately enough to prevent it from drying out. I would encourage you to purchase multiple small packages rather than one large one if you have multiple projects or just resign yourself to a lot of product loss. I personally used it to coat the ends of peg style towel holders so towels would stop slipping off the slick ends and into the floor. Worked, and I didn't have to remove old hardware and purchase new ones. That's a win.

### ⭐⭐⭐⭐ Works well, but product arrived with dry layer on top
*by E***D on March 5, 2025*

Product worked very well. Good amount of workable time, spreads well with a small spackling knife. The only complaint is that the product arrived with the top 1/8" dried up and unusable, and since you don't get that much in the can, having to throw away about 2 spoons full is a real problem. They need to seal the can lid better.

## 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.sn/products/214989981-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks-holes-block](https://www.desertcart.sn/products/214989981-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks-holes-block)

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*Product available on Desertcart Senegal*
*Store origin: SN*
*Last updated: 2026-07-07*