--- 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: "β‚©142841" currency: KRW in_stock: true reviews_count: 5 category: "Flex Paste" url: https://www.desertcart.kr/products/368440065-flex-paste-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks store_origin: KR region: South Korea --- # Waterproof & dries underwater Fully paintable finish Fills large gaps & cracks 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:** β‚©142841 **Availability:** βœ… In Stock ## Summary > πŸ›‘οΈ Seal it, paint it, forget it – the ultimate fix-it flex! ## 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?** β‚©142841 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.kr](https://www.desertcart.kr/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 - β€’ **Paint It Your Way:** Once cured, paint over it to match any surface and prevent rust and UV damage. - β€’ **Seal & Protect Like a Pro:** Creates a flexible, watertight rubberized barrier that blocks air, water, and moisture. - β€’ **Super Thick, Super Strong:** Instantly fills large holes and cracks with a durable, long-lasting seal. - β€’ **Apply Anywhere, Even Underwater:** Unique formula cures underwater, perfect for indoor and outdoor repairs. - β€’ **Stay Fresh Container Innovation:** Air-tight packaging locks in freshness to maximize sealing power and minimize waste. ## Overview Flex Paste Waterproof Paintable Putty is a versatile, black resin-based sealant designed to fill large gaps, cracks, and holes on multiple surfaces including drywall, concrete, and EPDM. It forms a flexible, waterproof, and UV-resistant barrier that can be applied and cured underwater. Packaged in an innovative stay-fresh container, it ensures long-lasting sealing power and is fully paintable to blend seamlessly with your project. Made in the USA and ASTM C-920 compliant, it’s ideal for professional-grade repairs on walls, roofs, RVs, and more. ## 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 - Flex Seal 2-Pack Black 17oz Stop Leaks Instantly, Waterproof Sealant Coating For Gutters, RV, Roof, Skylights, Windows --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.kr/products/368440065-flex-paste-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks](https://www.desertcart.kr/products/368440065-flex-paste-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks) --- *Product available on Desertcart South Korea* *Store origin: KR* *Last updated: 2026-06-21*