---
product_id: 225321582
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, Quart"
brand: "flex paste"
price: "A$129"
currency: AUD
in_stock: true
reviews_count: 13
category: "Flex Paste"
url: https://www.desertcart.com.au/products/225321582-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks-holes-block
store_origin: AU
region: Australia
---

# 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, Quart

**Brand:** flex paste
**Price:** A$129
**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, Quart by flex paste
- **How much does it cost?** A$129 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/225321582-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.
- • **Paint It Your Way:** Once cured, paint over it seamlessly to match any décor while preventing rust and UV damage.
- • **Fill Big, Fix Fast:** Super thick paste instantly fills large gaps, cracks, and holes with no sagging or shrinking.
- • **Freshness Locked In:** Innovative Stay Fresh container prevents air exposure, extending product life and eliminating waste.
- • **Versatile Application:** Perfect for walls, roofs, RVs, concrete, and even underwater repairs—no project too tough.

## 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 unique rubberized formula creates a flexible, watertight barrier that even cures underwater. Packaged in an air-tight Stay Fresh container, it ensures long-lasting sealing power with zero waste. Ideal for indoor and outdoor repairs on walls, roofs, RVs, and more, Flex Paste is UV resistant, paintable, and made in the USA.

## 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, Quart: desertcart.com: Tools & Home Improvement

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,,,
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.

## 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
- EXCELLENT FOR – filling cracks and holes, foundation and concrete repairs, sealing out rodents and pests, bath and shower, indoor and outdoor projects, roof, RV, motorhome, auto, marine, lawn and garden projects, DIY, hobbies, and more
- MADE IN THE USA

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B084TDDCWW |
| Best Sellers Rank | #16,717 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #50 in Hardware Sealers |
| Brand | Flex Paste |
| Color | Black |
| Date First Available | February 14, 2020 |
| Department | Unisex-Adult |
| Item Form | Paste |
| Item Weight | 3 pounds |
| Item dimensions L x W x H | 5 x 4.25 x 4.25 inches |
| Item model number | FLEX SEAL - PFSBLKR32 - BLACK |
| Manufacturer | Swift Response, LLC |
| Material | Rubber |
| Number of Items | 1 |
| Product Dimensions | 5 x 4.25 x 4.25 inches |
| Style | 3 lb Black |
| Surface Recommendation | Windows,Doors,Tub |
| UPC | 850010226811 |
| Unit Count | 48.0 Ounce |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** Flex Paste
- **Item Weight:** 3 Pounds
- **Item dimensions L x W x H:** 5 x 4.25 x 4.25 inches
- **Material:** Rubber
- **Style:** 3 lb 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, Quart - Image 1](https://m.media-amazon.com/images/I/81FPMiQYSaL.jpg)

## Available Options

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

## Questions & Answers

**Q: Could you do several layers or one very thick layer to create a rubberized coating on something?**
A: Absolutely, just please remember that the thicker the final coating is, the longer the cure time will be. We highly advise creating the coating by adding layers to the surface rather than just one thick coat.

**Q: Any temperature requirement?**
A: Flex Paste can be applied in a wide range of temperatures from 0°F – 150ۜ°F. Once applied and fully cured it can withstand a wider range of temperatures from -40°F – 200°F.

**Q: Can this be used to fix crack in small ref/frezer**
A: Hi there. Thank you so much for reaching out. Flex Paste can withstand low temps like that in a freezer. Although some customers have found success with similar applications, it has not been tested for its safety when coming in contact with items used for food preparation, storing, or serving. Please contact us if you have any additional questions. We're always happy to help. Flex On!

**Q: can flex paste be painted ?**
A: Yes. Must be fully cured before painting.

## Customer Reviews

### ⭐⭐⭐⭐⭐ 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,,,

### ⭐⭐⭐⭐⭐ 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.

### ⭐ 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, Quart
- Flex Seal, 14 oz, Clear, Stop Leaks Instantly, Transparent Waterproof Rubber Spray On Sealant Coating, Perfect for Gutters, Wood, RV, Campers, Roof Repair, Skylights, Windows, and More
- Flex Seal Liquid, 16 oz, Clear, Liquid Rubber Coating Sealant, Waterproof, Flexible, Breathable, and UV Resistant, Roof Repair, Basements, RV, Campers, Trailers, Marine, EPDM, Masonry

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**Shop now:** [https://www.desertcart.com.au/products/225321582-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks-holes-block](https://www.desertcart.com.au/products/225321582-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks-holes-block)

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-03-19*