MyPond MS300 Black Sealant 300ml - Professional Marine Grade Pond & Aquarium Sealant

MyPond MS300 Collection: Premium Pond & Window Sealant

Upgrade your pond build or repair with the MyPond MS300 Collection—our best-selling, expert-grade sealant range for UK pond keepers, installers, and DIYers. Designed for reliability and versatility, MS300 delivers a watertight, flexible, and ultra-strong bond on concrete, glass, metal, timber, stone, and pond liners.
Why Choose MyPond MS300?
  • 4x Stronger than Standard Aquarium Silicone: Industrial-grade MS Polymer adhesive for maximum durability.
  • Bonds Wet or Dry: Apply directly to wet or submerged areas—even underwater. Fully cures in 24 hours.
  • Fish & Wildlife Safe: Non-toxic once cured. Suitable for koi, turtles, amphibians, and all aquatic life.
  • Permanently Flexible: Resists cracking and shrinking in extreme outdoor temperatures and movement.
  • Multi-Surface Performance: Use as a pond sealer, window sealer, gutter sealant, or for garden features, bathrooms, kitchens, and more.
  • Mould & UV Resistant: Long-lasting waterproof protection, prevents mould build-up, and stands up to harsh UV.
  • Professional Finish: Clean, nearly invisible seal for windows and glass panels.
Ideal Applications:
  • Sealing pond windows, garden ponds, and water features
  • Repairing leaks in concrete, glass, metal, timber, and stone
  • Installing pond viewing windows and underwater panels
  • DIY, trade, and professional pond builds
  • Bathrooms, kitchens, showers, and high-moisture areas
Product Range:
  • MS300 Marine Sealant (Black, 300ml)
  • MS300 Clear Sealant
  • Accessories for application and finishing
Trusted by UK Pond Builders Over 100,000 units sold, with 4.4/5 star average reviews. Chosen by professionals for reliability, ease of use, and lasting results.
Order direct from CWD Sandbach LTD for fast UK delivery and expert support.