---
product_id: 368440065
title: "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"
brand: "flex paste"
price: "₹ 5381"
currency: INR
in_stock: true
reviews_count: 5
category: "Flex Paste"
url: https://www.desertcart.in/products/368440065-flex-paste-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks
store_origin: IN
region: India
---

# Dries underwater Fully paintable finish Waterproof & UV resistant seal 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

**Brand:** flex paste
**Price:** ₹ 5381
**Availability:** ✅ In Stock

## Summary

> 🛠️ Seal it, paint it, forget it — Flex Paste has your repairs covered!

## Quick Answers

- **What is this?** 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 by flex paste
- **How much does it cost?** ₹ 5381 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.in](https://www.desertcart.in/products/368440065-flex-paste-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks)

## 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

- • **Custom Finish:** Once cured, paint it any color to match your style while preventing rust and UV damage.
- • **Underwater Wonder:** Unique formula allows application and curing even underwater, no project too wet.
- • **Seal with Confidence:** Creates a flexible, watertight rubberized barrier that blocks air, water, and moisture.
- • **Versatile Application:** Perfect for indoor/outdoor use on walls, roofs, RVs, concrete, and more—fills large gaps instantly.
- • **Stay Fresh, Stay Ready:** Innovative airtight container locks in freshness to prevent waste and extend sealing power.

## Overview

Flex Paste is a premium waterproof, paintable putty designed to fill and seal gaps, cracks, and holes with a durable, flexible rubberized barrier. Its innovative airtight container preserves freshness, while its unique formula allows application and drying underwater. Ideal for a wide range of surfaces including drywall, concrete, roofs, and RVs, it offers UV resistance and a fully paintable finish for seamless repairs that last.

## Description

Product Description

## 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 |
| Best Sellers Rank | #43,336 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #181 in Hardware Sealers |
| Brand | Flex Paste |
| Brand Name | Flex Paste |
| Colour | Black |
| Compatible Material | Diy |
| Country of Publication | USA |
| Customer Reviews | 3.8 out of 5 stars 3,134 Reviews |
| Included Components | Household Item |
| Item Dimensions | 10.8 x 10.8 x 6.4 Centimeters |
| Item Form | Paste |
| Item Type Name | Flex Paste 1 lb Jar (Black) |
| Item dimensions L x W x H | 10.8 x 10.8 x 6.4 Centimeters |
| Manufacturer | Swift Response, LLC |
| Manufacturer Part Number | PFSBLKR16 |
| Material | Resin |
| Material Type | Resin |
| Model | FLEX SEAL - PFSBLKR16 - BLACK |
| Number of Items | 1 |
| Style | Compact |
| Style Name | Compact |
| Supported Standards | ASTM C-920 |
| Surface Recommendation | Windows,Doors |
| UPC | 850010226804 |
| Unit Count | 473.18 Milliliters |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** Flex Paste
- **Item Weight:** 1 Pounds
- **Item dimensions L x W x H:** 10.8 x 10.8 x 6.4 Centimeters
- **Material:** Resin
- **Style:** Compact

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/41XUoX1+-+L.jpg)
![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 - Image 2](https://m.media-amazon.com/images/I/71id8yOrn8L.jpg)
![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 - Image 3](https://m.media-amazon.com/images/I/71yd+Gnyk+L.jpg)
![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 - Image 4](https://m.media-amazon.com/images/I/71xvXuxwrIL.jpg)
![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 - Image 5](https://m.media-amazon.com/images/I/71mAPcut5pL.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*



### ⭐⭐⭐⭐⭐ Review
*by G***S on 4 November 2022*



### ⭐⭐⭐⭐⭐ Review
*by G***N on 19 April 2026*



## 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
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**Shop now:** [https://www.desertcart.in/products/368440065-flex-paste-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks](https://www.desertcart.in/products/368440065-flex-paste-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks)

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*Product available on Desertcart India*
*Store origin: IN*
*Last updated: 2026-05-15*