---
product_id: 428257690
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, Half-Quart"
brand: "flex paste"
price: "¥15772"
currency: JPY
in_stock: true
reviews_count: 5
category: "Flex Paste"
url: https://www.desertcart.jp/products/428257690-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks-holes-block
store_origin: JP
region: Japan
---

# Dries underwater, perfect for wet repairs Fully paintable for seamless finish Waterproof & UV resistant barrier Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs, White, Half-Quart

**Brand:** flex paste
**Price:** ¥15772
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal it, paint it, forget it — the ultimate fix-it flex!

## 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, Half-Quart by flex paste
- **How much does it cost?** ¥15772 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/428257690-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 shield that blocks air, water, and moisture for lasting protection.
- • **Invisible Repairs:** Paintable once cured—blend repairs flawlessly into any wall, roof, or RV surface.
- • **Freshness Locked In:** Innovative stay-fresh container prevents waste and keeps your paste ready for action every time.
- • **Versatile & Durable:** UV resistant and rust-preventive, ideal for indoor/outdoor, concrete, drywall, marine, and more.
- • **Big Gaps? No Problem:** Super thick formula clings instantly to fill large cracks, holes, and gaps with ease.

## 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 dries into a flexible, watertight barrier that resists UV damage and corrosion. Packaged in an innovative stay-fresh container, it can even be applied and cured underwater, making it a versatile solution for both indoor and outdoor 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, White, Half-Quart : desertcart.in: Industrial & Scientific

Review: Excelente !! - Excelente producto, hace todo lo que promete. Solo lo puedes usar una vez, lo deje muy bien tapado como venía en el instructivo y se seco, pero cumple perfectamente su función.
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
- 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 | B084TDJLKT |
| Are batteries included? | No |
| Best Sellers Rank | #176,268 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #688 in Hardware Sealers |
| Brand | Flex Paste |
| Colour | White |
| Country of Origin | USA |
| Customer Reviews | 3.7 3.7 out of 5 stars (3,078) |
| Date First Available | 17 July 2020 |
| Generic Name | Flex Paste |
| Included Components | Paste |
| Item Dimensions LxWxH | 10.8 x 10.8 x 6.4 Centimeters |
| Item Form | Paste |
| Item Height | 2.5 Inches |
| Item Weight | 454 g |
| Item Width | 4.25 Inches |
| Item dimensions L x W x H | 10.8 x 10.8 x 6.4 Centimeters |
| Item model number | FLEX SEAL - PFSWHTR16 - WHITE |
| Manufacturer | Swift Response, LLC |
| Material | Rubber |
| Model number | FLEX SEAL - PFSWHTR16 - WHITE |
| Net Quantity | 473.18 Milliliters |
| Number of Items | 1 |
| Product Dimensions | 10.8 x 10.8 x 6.35 cm; 453.59 g |
| Special Feature | Strong |
| Specific Product Use | wood |
| Style | Compact |
| Surface Recommendation | Tile |
| UPC | 850010226835 |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** Flex Paste
- **Item Weight:** 454 g
- **Item dimensions L x W x H:** 10.8 x 10.8 x 6.4 Centimeters
- **Material:** Rubber
- **Style:** Compact

## 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, Half-Quart - Image 1](https://m.media-amazon.com/images/I/71-IKakfInL.jpg)

## Available Options

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

## Questions & Answers

**Q: Can this be used on flexible surfaces?**
A: Depends on how flexible. It has to be able to adhere to the surface. It cures the same as rubber in a tire. There is some give.

**Q: Seal wet surface**
A: Hello there. That's an excellent question. Flex Paste can be applied to dry or wet surfaces and even underwater. It does not dissolve, creating a watertight seal. Thank you very much for reaching out to us with your question. Please write to us anytime. We're always happy to help. Flex On!

**Q: Flex seal pasta can it be used on curved surfaces?**
A: Yes it can be used on any curved and even upside down surface but if ordering on-line, if you open the can and the edges are turning hard return it ASAP because chances is it's hard on bottom as-well and you don't get your money worth

**Q: Can I use in a in ground swimming pool to repair a crack**
A: Yes, it can be applied underwater. It won’t dissolve or wash away. It even dries underwater! Flex Paste is easy to use. With a putty knife, trowel, spatula, roller, or stiff brush remove a smooth even layer of material from the top of the tub. Scooping deeply into the tub may cause air pockets which can dry FLEX PASTE.  Apply a generous amount using a smooth sweeping motion.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Excelente !!
*by G***S on 4 November 2022*

Excelente producto, hace todo lo que promete. Solo lo puedes usar una vez, lo deje muy bien tapado como venía en el instructivo y se seco, pero cumple perfectamente su función.

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

### ⭐⭐⭐ 半分は固まり
*by 関***雄 on 14 May 2025*

トップライトの雨漏りに、ガラス周りをこのペーストでシーリングしました。効果は高いけど購入の半分は固まりで使えない

## 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, White, Half-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

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**Shop now:** [https://www.desertcart.jp/products/428257690-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks-holes-block](https://www.desertcart.jp/products/428257690-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks-holes-block)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-02-21*