---
product_id: 532406096
title: "MS300 Marine Sealant, Window Sealer, Pond Sealer for Leaks Concrete Glass Metal, MS Polymer Adhesive 4x Stronger than Aquarium Silicone Caulking, Black Pond Liner Marine Adhesive Sealant, 300ml"
brand: "mypond"
price: "8733 som"
currency: KGS
in_stock: true
reviews_count: 13
category: "My Pond"
url: https://www.desertcart.kg/products/532406096-ms300-marine-sealant-window-sealer-pond-sealer-for-leaks-concrete
store_origin: KG
region: Kyrgyzstan
---

# Marine-grade waterproof seal 4x stronger than silicone Cures underwater in 24h MS300 Marine Sealant, Window Sealer, Pond Sealer for Leaks Concrete Glass Metal, MS Polymer Adhesive 4x Stronger than Aquarium Silicone Caulking, Black Pond Liner Marine Adhesive Sealant, 300ml

**Brand:** mypond
**Price:** 8733 som
**Availability:** ✅ In Stock

## Summary

> Seal the deal with confidence 💧 – stronger, faster, and fish-friendly!

## Quick Answers

- **What is this?** MS300 Marine Sealant, Window Sealer, Pond Sealer for Leaks Concrete Glass Metal, MS Polymer Adhesive 4x Stronger than Aquarium Silicone Caulking, Black Pond Liner Marine Adhesive Sealant, 300ml by mypond
- **How much does it cost?** 8733 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/532406096-ms300-marine-sealant-window-sealer-pond-sealer-for-leaks-concrete)

## Best For

- mypond enthusiasts

## Why This Product

- Trusted mypond brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Fish-Safe Formula 🐟:** Protects aquatic life with a non-toxic sealant ideal for koi ponds, aquariums, and fountains.
- • **Versatile Bonding 🌐:** Adheres seamlessly to concrete, glass, metal, wood, rubber, and more for all your sealing needs.
- • **Unmatched Strength 💪:** 4 times stronger than traditional aquarium silicone for durable, long-lasting seals.
- • **Rapid Underwater Cure ⏱️:** Sets firmly underwater within 24 hours, accelerating your pond repair projects.
- • **All-Weather Durability 🌧️:** Marine-grade hybrid polymer resists harsh weather and water exposure for year-round reliability.

## Overview

MyPond MS300 is a 300ml marine-grade MS polymer sealant designed for professional-grade pond, aquarium, and window repairs. It offers 4x the strength of traditional silicone, cures underwater in just 24 hours, and bonds to a wide range of materials including concrete, glass, and metal. Its fish-safe formula ensures aquatic environments remain healthy while providing a durable, waterproof seal that withstands all weather conditions.

## Description

MyPond MS300 Marine Sealant, Window Sealer, Pond Sealer for Leaks Concrete Glass Metal, MS Polymer Adhesive 4x Stronger than Aquarium Silicone Caulking, Black Pond Liner Marine Adhesive Sealant, 300ml : desertcart.co.uk: Garden

Review: Very good, very messy - Quite awkward to work with, it sticks like mad to anything it touches, other than where you want it to stick or course. Cleaning it off your skin and nails afterwards is a challenge! But it cures very quickly even in cold weather and underwater and cured my leaky pond problems.
Review: Seals great - Good product

## Features

- RELIABLE DIY POND REPAIR SOLUTION: MyPond heavy duty A+ grade hybrid adhesive or hybrid sealant make repairs and upgrades simple for DIY enthusiasts and professionals. This marine grade pond sealant helps you fix leaks and improve your pond or aquarium for long-lasting results. Our marine grade silicone sealant, waterproof hybrid polymer sealant works excellently as a pond leak sealer, fountain sealer, and even a koi pond sealer, ensuring durability for all your water features.
- STRONGER THAN TRADITIONAL SILICONE: Our pond sealant fish safe is 4 times stronger than regular waterproof silicone sealant, providing superior sealing power for your pond and water features. Whether you need a pond sealer, pond leak sealer, or aquarium MS polymer sealant, our marine grade MS polymer adhesive sealant ensures fewer repairs and long-lasting protection. It also works well as a glass sealant, window sealant, pond window sealer, or even a gutter sealant for rain gutters.
- FAST CURING UNDERWATER: This waterproof MS polymer glue cures underwater in just 24 hours, saving you time and hassle on your DIY pond projects. Ideal for use as a pond sealer, pond leak sealer, or underwater sealant, it provides quick, reliable results. Whether you're sealing a fish pond or repairing an aquarium, this aquarium silicone black marine silicone, pond sealer for leaks ensures your projects are completed efficiently, with lasting results.
- VERSATILE AND FLEXIBLE BONDING: Our MS polymer adhesive bonds securely to materials like concrete, stone, wood, glass, metal, rubber, plastic, and fiberglass. This makes it a versatile choice for a wide range of projects, including as an aquarium sealant, aquarium caulk, window crack repair and marine sealant for all water-based applications. It works as a fish pond sealant, fountain sealer, and even for koi pond repairs.
- FISH-SAFE FORMULA FOR AQUATIC LIFE: Ensure the safety of your aquatic life with our pond sealer safe for fish. This fish pond sealant is great for maintaining a healthy, natural environment in your pond. Whether you're using it as a pond leak sealer, marine grade MS polymer sealant, aquarium MS polymer sealant, or reptile safe sealant, our MyPond MS300 sealant, marine caulking keeps your water feature safe for fish, plants, and reptiles alike.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0C2VBJ2BL |
| Batteries Required? | No |
| Batteries included? | No |
| Best Sellers Rank | 2,092 in Garden ( See Top 100 in Garden ) 7 in Pond Care & Water Treatment |
| Customer Reviews | 4.4 4.4 out of 5 stars (278) |
| Date First Available | 16 Oct. 2023 |
| Item Weight | 450 g |
| Manufacturer | MyPond |
| Manufacturer reference | Ms-300 |
| Package Dimensions | 23.9 x 14.4 x 10.5 cm; 450 g |
| Part number | Ms-300 |
| Style | Compact |

## Product Details

- **Brand:** MyPond
- **Item form:** Liquid
- **Style:** Compact
- **Unit count:** 300.0 millilitre(s)
- **Water resistance level:** Waterproof

## Images

![MS300 Marine Sealant, Window Sealer, Pond Sealer for Leaks Concrete Glass Metal, MS Polymer Adhesive 4x Stronger than Aquarium Silicone Caulking, Black Pond Liner Marine Adhesive Sealant, 300ml - Image 1](https://m.media-amazon.com/images/I/61UxtwISZiL.jpg)

## Questions & Answers

**Q: Can this sealant be applied to a pond or aquarium while it’s filled with water, or must the surface be dry first?**
A: It can be applied directly to wet or submerged areas. This underwater sealant fully cures in 24 hours and becomes a pond sealant fish safe once dry, making it ideal for aquariums, koi ponds, fountains, and other aquatic environments.

**Q: Will the sealant bond effectively to a wide range of surfaces like wood, metal, plastic, stone, and glass?**
A: Yes, this hybrid polymer sealant offers strong, flexible adhesion to glass, stone, plastic, and more. It also performs well as a glass sealant, ensuring waterproof protection and long-term durability on a variety of indoor and outdoor surfaces.

**Q: Once the sealant is fully cured, is it safe for all aquatic life, including koi fish, turtles, and amphibians?**
A: Once cured, it’s completely non-toxic. It works as a koi pond sealer and pond sealer safe for fish, reptiles, and amphibians. Ideal for tanks, ponds, or habitats where the safety of aquatic animals and plants is critical and long-lasting.

**Q: Is this suitable for sealing bathrooms, kitchen sinks, or windows where strong waterproofing is essential?**
A: Absolutely. It works as a window sealer and waterproof silicone for high-moisture areas like showers, tiles, sinks, and windows. It delivers long-lasting protection, prevents mold buildup, and provides a clean, nearly invisible finish.

**Q: Will this product stay flexible after curing, especially when exposed to outdoor temperatures and movement?**
A: Yes, it remains permanently flexible after curing. This adhesive sealant resists cracking or shrinking, even in changing temperatures. Ideal as a floor sealant and for roofs, walls, garden features, and high-movement outdoor joints.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Very good, very messy
*by G***A on 20 March 2025*

Quite awkward to work with, it sticks like mad to anything it touches, other than where you want it to stick or course. Cleaning it off your skin and nails afterwards is a challenge! But it cures very quickly even in cold weather and underwater and cured my leaky pond problems.

### ⭐⭐⭐⭐⭐ Seals great
*by M***M on 1 November 2025*

Good product

### ⭐⭐⭐⭐ It works ,its sticky
*by B***N on 22 June 2025*

It works ! fountain no longer leaks , it was important for it to be non toxic. Get everything ready in advance including a waste bag, def wear disposable gloves

## Frequently Bought Together

- MyPond MS300 Marine Sealant, Window Sealer, Pond Sealer for Leaks Concrete Glass Metal, MS Polymer Adhesive 4x Stronger than Aquarium Silicone Caulking, Black Pond Liner Marine Adhesive Sealant, 300ml
- Gorilla Waterproof Patch & Seal Tape Black 3m
- Double Sided Butyl Tape Used for Membrane Jointing, Waterproofing, Pond Liner Repair (50MM X 1.5MM X 10M)

---

## 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.kg/products/532406096-ms300-marine-sealant-window-sealer-pond-sealer-for-leaks-concrete](https://www.desertcart.kg/products/532406096-ms300-marine-sealant-window-sealer-pond-sealer-for-leaks-concrete)

---

*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-01-27*