--- product_id: 48209530 title: "Underwater Sealant, 290 ml, Black" brand: "gold label" price: "€ 48.15" currency: EUR in_stock: true reviews_count: 13 category: "Gold Label" url: https://www.desertcart.es/products/48209530-underwater-sealant-290-ml-black store_origin: ES region: Spain --- # Instant underwater bonding Bonds 8+ surfaces seamlessly Solvent & isocyanate free safe formula Underwater Sealant, 290 ml, Black **Brand:** gold label **Price:** € 48.15 **Availability:** ✅ In Stock ## Summary > 💧 Seal it once, seal it right—underwater magic for pros! ## Quick Answers - **What is this?** Underwater Sealant, 290 ml, Black by gold label - **How much does it cost?** € 48.15 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/48209530-underwater-sealant-290-ml-black) ## Best For - gold label enthusiasts ## Why This Product - Trusted gold label brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Compact & Ready-to-Use:** 290ml tube designed for precision repairs without mess. - • **Eco-Safe & Fish Friendly:** Protect your pond ecosystem with solvent-free, non-toxic sealant. - • **Durable Waterproof Shield:** Stops water loss and protects your investment long-term. - • **Seal Leaks Instantly Underwater:** No downtime, no drying—fix leaks where they happen. - • **Universal Surface Compatibility:** Works flawlessly on vinyl, glass, ceramic, concrete, and more. ## Overview Gold Label Underwater Sealant (290ml, black) is a premium, solvent- and isocyanate-free sealant designed for instant, durable repairs underwater. Trusted by pond and aquarium owners, it bonds a wide range of materials including vinyl, glass, ceramic, and concrete, ensuring waterproof protection without harming aquatic life. ## Description Product Description Gold Label Underwater Sealant 290ml black Box Contains Gold Label Underwater Sealant 290ml black Review: Good but over priced - Although the stars above do not reflect how good this stuff is it is a life saver! I have a very large koi pond that had 2 big leaks, one inside the filter box where I had to do a modification and one inside the plastic skimmer which is part of the main pond itself. I used this silicone to put a complete layer over the filter leak, and pretty much the same in the skimmer, my water loss has gone from around 4 inches of water per week to zero, if this hadn't of worked I was looking at a complete overall of both pond and box. Value? It is very expensive for what it is, I work in construction where there are specialist products for half the price so unless you definately need this look else where! Also ease of use! Not at all, wouldn't fancy trying to get it to stick underwater? It was hard enough to get it off of your fingers when dry! Having said all this IF you are at the last option you won't go wrong by buying this stuff, I went straight for black bigtube! Review: Great - Great product never fails ## Features - Contains sensitizing substances. May produce an allergic reaction. - Pond and Aquarium Sealer - Fish safe sealer that can be used underwater for instant repairs - Solvent & Isocyanate Free - Bonds all surfaces - Ideal for Butyl Rubber, Vinyl, Glass, Plastic, Ceramic, Stone, Concrete and more ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0038LYLN0 | | Best Sellers Rank | 17,047 in Garden ( See Top 100 in Garden ) 1,495 in Garden Décor | | Brand | Gold Label | | Colour | Black | | Compatible Material | Ceramic, Glass, Plastic, Vinyl | | Customer Reviews | 4.4 out of 5 stars 906 Reviews | | Global Trade Identification Number | 05060159850036 | | Item Dimensions | 50 x 50 x 240 millimetres | | Item Form | Liquid | | Item Weight | 0.5 Kilograms | | Item dimensions L x W x H | 50 x 50 x 240 millimetres | | Item weight | 0.5 Kilograms | | Manufacturer | Gold Label | | Manufacturer Part Number | S30 | | Material | Rubber | | Model Number | S30 | | Number of Items | 1 | | Number of Packs | 1 | | Style | Compact | | Style Name | Compact | | Surface Recommendation | Countertop, Door, Pipe, Tile, Window | | Unit Count | 290.0 millilitre | | Water Resistance Level | Waterproof | | Water resistance level | Waterproof | ## Product Details - **Brand:** Gold Label - **Item dimensions L x W x H:** 50 x 50 x 240 millimetres - **Item weight:** 0.5 Kilograms - **Material:** Rubber - **Style:** Compact ## Images ![Underwater Sealant, 290 ml, Black - Image 1](https://m.media-amazon.com/images/I/61vlIhl9gcL.jpg) ## Questions & Answers **Q: It says on your product Safety that it's " Harmful to aquatic life with long lasting effects." .I don't understand.** A: No idea about it being harmful. I used it to join two bits of liner that is under an artificial bog. **Q: I have a 6 inch hairline crack in my fibreglass fish pond, will this fix it?** A: I haven’t used this product for that purpose but it is supposed to bond layers together and seal joints so may be worth a try. **Q: Has anybody used it on a glass aquarium. I need to do an underwater repair with the tropical fish still in the tank.** A: It will seal underwater and is non toxic. I have used it in a pond. The tube I had was black sealant though. **Q: Can gold label underwear sealantI have a hole at the bottom of my fish pond do i have to completely drain my pond to fix the leak** A: On the container it states that the glue will work underwater, which implies that you don't have to drain the pond. However, the instructions also tell you to remove all mud, silt and algae. To do this you have to lower the water level until the damage is exposed so that you can clean up around it. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good but over priced *by S***K on 14 April 2020* Although the stars above do not reflect how good this stuff is it is a life saver! I have a very large koi pond that had 2 big leaks, one inside the filter box where I had to do a modification and one inside the plastic skimmer which is part of the main pond itself. I used this silicone to put a complete layer over the filter leak, and pretty much the same in the skimmer, my water loss has gone from around 4 inches of water per week to zero, if this hadn't of worked I was looking at a complete overall of both pond and box. Value? It is very expensive for what it is, I work in construction where there are specialist products for half the price so unless you definately need this look else where! Also ease of use! Not at all, wouldn't fancy trying to get it to stick underwater? It was hard enough to get it off of your fingers when dry! Having said all this IF you are at the last option you won't go wrong by buying this stuff, I went straight for black bigtube! ### ⭐⭐⭐⭐⭐ Great *by S***R on 6 September 2026* Great product never fails ### ⭐⭐⭐⭐ Sticks to anything including you! *by S***T on 6 May 2019* Have used this on various parts of my koi pond setup. Sealing permanent joints in various pipework and filter fittings. As I say it sticks to anything. gloves are a must! This time it was fibreglass to stone joints on waterfall that had opened up and was leaking. Don't try to use on anything you may want to take apart at a later date. I do find that unless you seal an open tube very well and come back to it a month or two later, it will have all set! So the 290ml cartridge is not that economical if you just need a small amount. The one-shot tube is as it says. 'one-shot' So hence the 1-star off as I'd like to see a small say 100-150 cartridge tube that could be less wasteful. I see other comments on the clear version that says it's not so 'good' I have only ever used the black so could not comment on that point. It is expensive but does the job! ## Frequently Bought Together - Gold Label Underwater Sealant, 290 ml, Black - TotalPond Waterfall Foam Sealant - GREAT STUFF 99112849 Smart Dispenser Pond & Stone, 12 oz, Black --- ## 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.es/products/48209530-underwater-sealant-290-ml-black](https://www.desertcart.es/products/48209530-underwater-sealant-290-ml-black) --- *Product available on Desertcart Spain* *Store origin: ES* *Last updated: 2026-09-18*