--- product_id: 267848373 title: "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: "319.95 DT" currency: TND in_stock: true reviews_count: 5 url: https://www.desertcart.tn/products/267848373-1-lb-jar-black-waterproof-paintable-putty-spackle-sealant-fill store_origin: TN region: Tunisia --- # Dries underwater, seals gaps instantly Strong, flexible rubberized barrier Waterproof & UV resistant 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:** 319.95 DT **Availability:** ✅ In Stock ## Summary > 🛠️ Flex Paste: Seal, Protect, and Never Look Back! ## Quick Answers - **What is this?** 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?** 319.95 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/267848373-1-lb-jar-black-waterproof-paintable-putty-spackle-sealant-fill) ## 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, flexible rubberized layer - • **Stay Fresh Tech:** Innovative airtight container locks in freshness—no wasted paste - • **Paint It Your Way:** Fully paintable after curing to match any aesthetic or project - • **Multi-Surface Master:** Works on concrete, drywall, metal, EPDM, and more—indoor & outdoor ready - • **Underwater Application:** Unique formula cures underwater for ultimate versatility ## Overview Flex Paste is a premium 1 lb black waterproof sealant paste that creates a strong, flexible, rubberized barrier to block air, water, and moisture. It features a stay-fresh container to prevent waste, cures underwater, and is fully paintable. Ideal for filling large gaps, cracks, and holes on a wide range of surfaces including concrete, drywall, metal, and EPDM, making it perfect for professional-grade indoor and outdoor repairs, DIY projects, and more. ## 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. ## 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 | #74,861 in Tools & Home Improvement (See Top 100 in Tools & Home Improvement) #100 in Putty Knives | | Brand Name | Flex Paste | | Color | Black | | Compatible Material | Wood, Glass, Tile, Concrete, Aluminum, Metal, Brick, Stucco, Masonry, Copper, Fabric, Fiberglass, Ceramic, Porcelain, Natural Stones, Roofing, Pvc, Eifs, Cspe, Epdm, Hypalon Polyurethanes | | Customer Reviews | 3.8 3.8 out of 5 stars (3,144) 3.8 out of 5 stars | | 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 Weight | 454 g | | Manufacturer | Swift Response, LLC | | Material Type | Rubber | | Model | FLEX SEAL - PFSBLKR16 - BLACK | | Number Of Items | 1 | | Part Number | PFSBLKR16 | | Style Name | 1 lb Black | | Supported Standards | ASTM C-920 | | Surface Recommendation | Windows,Doors | | Unit Count | 1 Count | | Upc | 850010226804 | | Water Resistance Level | Waterproof | ## Product Details - **Brand:** Flex Paste - **Item dimensions L x W x H:** 10.8 x 10.8 x 6.4 centimeters - **Material:** Rubber - **Style:** 1 lb Black - **Water resistance level:** Waterproof ## Images ![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/41XUoX1+-+L.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 ### ⭐⭐⭐⭐⭐ Good product *by on Reviewed in Australia 12 June 2026* Very good sealing properties worked well on steel roof. ### ⭐⭐⭐⭐⭐ loved it *by on Reviewed in Canada 3 February 2026* fixed the problem we had ### ⭐⭐⭐⭐⭐ Excelente !! *by on Reviewed in Mexico 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. ## 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? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.tn/products/267848373-1-lb-jar-black-waterproof-paintable-putty-spackle-sealant-fill](https://www.desertcart.tn/products/267848373-1-lb-jar-black-waterproof-paintable-putty-spackle-sealant-fill) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-08-07*