---
product_id: 267848373
title: "Flex Paste, 1 lb Jar, Black, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs"
brand: "flex paste"
price: "₱3031"
currency: PHP
in_stock: true
reviews_count: 5
category: "Flex Paste"
url: https://www.desertcart.ph/products/267848373-flex-paste-1-lb-jar-black-waterproof-paintable-putty-spackle
store_origin: PH
region: Philippines
---

# Dries underwater Strong flexible rubberized barrier Waterproof & UV resistant Flex Paste, 1 lb Jar, Black, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs

**Brand:** flex paste
**Price:** ₱3031
**Availability:** ✅ In Stock

## Summary

> 🖌️ Seal, protect, and flex your fix with Flex Paste—where durability meets style!

## Quick Answers

- **What is this?** Flex Paste, 1 lb Jar, Black, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs by flex paste
- **How much does it cost?** ₱3031 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ph](https://www.desertcart.ph/products/267848373-flex-paste-1-lb-jar-black-waterproof-paintable-putty-spackle)

## 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:** Blocks air, water & moisture with a durable rubberized shield
- • **Stay Fresh Tech:** Innovative airtight container locks in sealant freshness—no waste
- • **Underwater Ready:** Applies and cures underwater for ultimate versatility
- • **Paint It Your Way:** Fully paintable finish blends seamlessly with any surface
- • **Multi-Surface Master:** Perfect for walls, roofs, RVs, concrete & more—DIY or pro-grade

## Overview

Flex Paste is a premium 1 lb black waterproof putty that seals gaps, cracks, and holes with a flexible, rubberized barrier. It features a stay-fresh airtight container, cures underwater, and is fully paintable with UV resistance. Ideal for indoor/outdoor repairs on drywall, concrete, roofs, RVs, and more, it’s the go-to sealant for lasting protection and professional results.

## Description

Flex Paste is an excellent waterproof sealant. It can be used on windows, doors, vents, and thresholds. It's easy-to-use and perfect for all types of indorr and outdoor repairs. It's even greawt for DIY projects. Crafts, hobbies, and so much more.

Review: fixed the problem we had
Review: 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.

## 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 | B084TDS8S5 |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #115,632 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) |
| Color | Black |
| Customer Reviews | 3.7 3.7 out of 5 stars (3,102) |
| Date First Available | 13 August 2020 |
| Item model number | FLEX SEAL - PFSBLKR16 - BLACK |
| Material Type(s) | Rubber |
| Product Dimensions | 10.8 x 10.8 x 6.35 cm; 453.59 g |

## Product Details

- **Brand:** Flex Paste
- **Item dimensions L x W x H:** 10.8 x 10.8 x 6.4 centimeters
- **Item weight:** 454 g
- **Material:** Rubber
- **Style:** 1 lb Black

## Images

![Flex Paste, 1 lb Jar, Black, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs - Image 1](https://m.media-amazon.com/images/I/71Avii-yA1L.jpg)
![Flex Paste, 1 lb Jar, Black, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs - Image 2](https://m.media-amazon.com/images/I/81EH9xNxGqL.jpg)
![Flex Paste, 1 lb Jar, Black, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs - Image 3](https://m.media-amazon.com/images/I/81Po+dLJXJL.jpg)
![Flex Paste, 1 lb Jar, Black, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs - Image 4](https://m.media-amazon.com/images/I/81X0MV1+SrL.jpg)
![Flex Paste, 1 lb Jar, Black, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs - Image 5](https://m.media-amazon.com/images/I/81yaLw1mdAL.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

### ⭐⭐⭐⭐⭐ Review
*by F***T on 3 February 2026*

fixed the problem we had

### ⭐⭐⭐⭐⭐ Review
*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.

### ⭐⭐⭐⭐⭐ Review
*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,,,

## 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, Half-Quart
- 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

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**Shop now:** [https://www.desertcart.ph/products/267848373-flex-paste-1-lb-jar-black-waterproof-paintable-putty-spackle](https://www.desertcart.ph/products/267848373-flex-paste-1-lb-jar-black-waterproof-paintable-putty-spackle)

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*Product available on Desertcart Philippines*
*Store origin: PH*
*Last updated: 2026-03-07*