This is my second tube of this super sticky sealant which I have used to convert concrete garden flower bed bowls to water features with small solar fountains. I've cut a plastic disc and fixed to the base of my two garden bowls - so the sealant is always underwater. Could not find anything else that could do it but this has worked perfectly.
MyPond MS300 – All Purpose Clear Pond Sealant (300ml)
The Ultimate Pond Sealant for Professional & DIY Pond Builders
MyPond MS300 is the UK’s leading all-purpose pond sealant – trusted by pond professionals and hobbyists alike. Specially formulated for fish ponds, koi ponds, water features, and aquariums, this flexible, high-strength sealant delivers long-lasting, watertight results where ordinary silicone fails.
Key Features
Fish Safe & Aquatic Safe:100% non-toxic once cured, ideal for all pond life
Cures Underwater:Bonds and seals even when wet, perfect for emergency repairs
Bonds Pond Liners:Works on EPDM, Butyl, PVC (not laminated tarps)
Perfect for Pond Window Installation:Achieve clear, strong, leak-free viewing windows
Bottom Drain & Pipe Sealing:Reliable for drains, inlets, and plumbing joints
4x Stronger Than Silicone:Superior adhesion and flexibility for demanding pond projects
No Primer Needed:(Except on concrete – must be clean, dry, and primed)
Weatherproof & UV Resistant:Long-lasting seal in all UK conditions
Why Choose MyPond MS300?
High Performance:Modified silyl polyether base polymer for maximum durability
No Odour or Shrinkage:Zero formaldehyde, environmentally friendly, remains flexible after curing
Easy Application:Skins in 24 hours, full cure in thicker beads takes longer (remains flexible at core)
Professional Results:Used by leading pond installers across the UK
Application Tips
Apply to clean, dry surfaces
For best results, use a single large bead (minimum 2mm thick)
Supports curing underwater but requires support during cure
Avoid prolonged skin contact; rinse eyes with water if exposed
Trusted by Pond Experts Nationwide
Thousands of UK pond builders rely on MyPond MS300 for leak-free, crystal-clear results. Order your 300ml black MS300 cartridge today for fast, secure delivery.
MyPond UK Unit 5 High Carr Network Centre, Newcastle Under Lyme, ST5 7XE 01270 295992
