---
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: "VT6680"
currency: VUV
in_stock: true
reviews_count: 11
url: https://www.desertcart.vu/products/214989981-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks-holes-block
store_origin: VU
region: Vanuatu
---

# Dries underwater Fully paintable finish Waterproof & air-tight seal 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:** VT6680
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal it. Paint it. Forget it. The ultimate fix for pros who demand durability and style.

## 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?** VT6680 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/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

- • **Seal Like a Pro:** Creates a flexible, rubberized barrier that blocks water, air, and moisture for lasting protection.
- • **Custom Finish Ready:** Once cured, paint it any color to blend seamlessly while resisting UV damage and corrosion.
- • **Freshness Locked In:** Innovative stay-fresh container prevents waste and keeps the paste ready for your next fix.
- • **Big Gaps? No Problem:** Super thick formula clings instantly to fill large cracks, holes, and gaps with ease.
- • **Underwater Application:** Apply and cure even underwater—perfect for tough, wet repairs you thought impossible.

## Overview

Flex Paste is a premium waterproof, paintable putty designed to fill and seal gaps, cracks, and holes across multiple surfaces including drywall, concrete, and EPDM. Its thick, rubberized formula blocks air and water, cures underwater, and offers UV resistance. Packaged in a stay-fresh container, it ensures no waste and long-lasting sealing power, making it ideal for professional-grade repairs on walls, roofs, RVs, and more.

## Description

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 - desertcart.com

Review: It really works! - This is an a-m-a-z-i-n-g product!!! I stumbled on a small can of it in a hardware store. It works so well, that I purchased a gallon. I am using it on the roof of my motor coach and a box trailer.
Review: Good stuff, simple to use - I was worried bjt, it worked I repaired a fiberglass bathtub, it was thick, I globed it on and to worked good, my can was air tight and fresh, not permanent but long lasting patch, don't get it on your clothes,,,

## 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 | #17,966 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #71 in Hardware Sealers |
| 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 4.0 out of 5 stars (6,014) |
| 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 |
| Manufacturer | Swift Response, LLC |
| Material Type | Rubber |
| Model | FLEX SEAL - PFSBLKR10 - BLACK |
| Number of Items | 1 |
| Part Number | PFSBLKR10 |
| Style Name | 9 oz Black |
| Surface Recommendation | Windows,Doors |
| UPC | 850010226859 |
| Unit Count | 1.0 Count |
| 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/61cv+cPofgL.jpg)
![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 2](https://m.media-amazon.com/images/I/61dK90UK12L.jpg)
![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 3](https://m.media-amazon.com/images/I/914tMpgmSuL.jpg)
![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 4](https://m.media-amazon.com/images/I/9107B1PS2wL.jpg)
![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 5](https://m.media-amazon.com/images/I/810+KPaaYuL.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

### ⭐⭐⭐⭐⭐ It really works!
*by B***Y on February 20, 2026*

This is an a-m-a-z-i-n-g product!!! I stumbled on a small can of it in a hardware store. It works so well, that I purchased a gallon. I am using it on the roof of my motor coach and a box trailer.

### ⭐⭐⭐⭐⭐ Good stuff, simple to use
*by L***K on April 18, 2025*

I was worried bjt, it worked I repaired a fiberglass bathtub, it was thick, I globed it on and to worked good, my can was air tight and fresh, not permanent but long lasting patch, don't get it on your clothes,,,

### ⭐ Does NOT work as advertised!!!
*by C***S on October 28, 2024*

UPDATE - I have been monitoring the pipe for the last few days. While I initially thought the paste was going to provide the fix I needed, that "thought" would be incorrect. The water started leaking again. Be smart/save your money and do not buy this stuff. I'm going back to what I should have done to start with - turn off the water and replace the pipe. This Flex Paste is JUNK!!!! Had a very small leak at the base of this water faucet (small droplets of water on the PVC surface). Based on the advertisement I thought the paste would be the perfect fix. I followed the directions as stated on the container. After apply a good initial coat, I still had the small leak. The next day, I applied another coat - still had the leak. The next day, after turning off the water to everything, I applied another coat heavy/massive amount of paste using both a putty knife and my hand. Left the water off for 1 to 2 hours and the leak appears to have stopped (after using most of the paste). What a pain!!! While using the paste, I was diligent in keeping the lid on the paste. At the end of each day, I would use a rubber mallet to hammer the lid on. Regardless of the tight seal, the paste still hardened. Probably would have been easier to just replace the bad piece of PVC that was leaking.

## 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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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-05-09*