---
product_id: 372184459
title: "Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs, White, MAX"
brand: "flex paste"
price: "฿17287"
currency: THB
in_stock: true
reviews_count: 11
category: "Flex Paste"
url: https://www.desertcart.co.th/products/372184459-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks-holes-block
store_origin: TH
region: Thailand
---

# Fully paintable & UV resistant Waterproof & dries underwater 12 lb super thick rubber paste Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs, White, MAX

**Brand:** flex paste
**Price:** ฿17287
**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, White, MAX by flex paste
- **How much does it cost?** ฿17287 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/372184459-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, watertight rubberized barrier that blocks air, water, and moisture.
- • **Max Coverage Power:** Super thick 12 lb paste instantly fills large gaps, cracks, and holes with no sagging.
- • **Custom Finish Ready:** Once cured, paint over it seamlessly to match any surface while preventing rust and UV damage.
- • **Freshness Locked In:** Innovative airtight container keeps paste fresh and ready, eliminating waste and drying out.
- • **Underwater Application:** Unique formula allows application and curing even underwater—no project too wet.

## Overview

Flex Paste is a 12-pound, waterproof, paintable rubberized putty designed for professional-grade sealing and repairs. It blocks air, water, and moisture by forming a flexible barrier that cures even underwater. Packaged in an airtight container to maintain freshness, it fills large cracks and holes on surfaces like drywall, concrete, roofs, and RVs. UV resistant and paintable, it offers a durable, customizable finish ideal for indoor and outdoor projects.

## 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, White, MAX: 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: 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.

## 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 | B09CQ8ZFRY |
| Best Sellers Rank | #16,551 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #50 in Hardware Sealers |
| Brand | Flex Paste |
| Color | White |
| Date First Available | August 11, 2021 |
| Department | Unisex-Adult |
| Item Form | Paste |
| Item Weight | 12 pounds |
| Item dimensions L x W x H | 7.75 x 6.75 x 6.75 inches |
| Item model number | Flex Seal FamilyofProducts - PFSMAXWHT01 |
| Manufacturer | Swift Response, LLC |
| Material | Rubber |
| Number of Items | 1 |
| Product Dimensions | 7.75 x 6.75 x 6.75 inches |
| Style | 12 lb White |
| Surface Recommendation | Doors,Windows |
| UPC | 850017897489 |
| Unit Count | 192.0 Ounce |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** Flex Paste
- **Item Weight:** 12 Pounds
- **Item dimensions L x W x H:** 7.75 x 6.75 x 6.75 inches
- **Material:** Rubber
- **Style:** 12 lb White

## Images

![Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs, White, MAX - Image 1](https://m.media-amazon.com/images/I/81vv0bSfptL.jpg)

## Available Options

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

## 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,,,

### ⭐⭐⭐⭐⭐ 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.

### ⭐ 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.

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**Shop now:** [https://www.desertcart.co.th/products/372184459-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks-holes-block](https://www.desertcart.co.th/products/372184459-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks-holes-block)

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-02-22*