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💧 Seal smarter, not harder — the ultimate fix for every leak!
MyPond MS300 Marine Sealant is a premium 300ml MS polymer adhesive that delivers 4x the strength of standard aquarium silicone. Waterproof and fast-curing underwater within 24 hours, it bonds securely to over a dozen materials including concrete, glass, and metal. Engineered for pond, aquarium, window, and marine repairs, its fish-safe formula ensures a durable, eco-friendly seal that keeps leaks at bay and aquatic life safe.
| ASIN | B0C2VBJ2BL |
| Best Sellers Rank | 2,844 in Garden ( See Top 100 in Garden ) 38 in Pond Care & Water Treatment |
| Brand | MyPond |
| Compatible Material | Concrete, Stone, Wood, Glass, Metal, Rubber, Plastic, Fiberglass, Acrylic, Glass Reinforced Plastic, Porcelain, Vinyl, StoneConcrete, Stone, Wood, Glass, Metal, Rubber, Plastic, Fiberglass, Acrylic, Glass Reinforced Plastic, Porcelain, Vinyl, Stone |
| Country Of Origin | United Kingdom |
| Customer Reviews | 4.4 4.4 out of 5 stars (318) |
| Item Form | Liquid |
| Manufacturer | MyPond |
| Manufacturer Part Number | Ms-300 |
| Number of Items | 1 |
| Style Name | Compact |
| Surface Recommendation | Window |
| Unit Count | 300.0 millilitre |
| Water Resistance Level | Waterproof |
A**R
Effective
The sealant was as described and worked well
D**D
Quality of product
Love this product great adhesive power
B**N
It works ,its sticky
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
M**L
The best
As expected...first class.
C**F
Does the job.
Did the job, sealed the crack in my concrete pond, even below the waterline. Best to use gloves though as would be hard to remove from skin.
M**L
Doesn't work with preformed pond liners
Seams like decent stuff, but would not adhere to a pond liner and concrete seam and had all fallen off by the following day.
A**R
Should do the job
I am.using this to build a water feature. It seams to be working very well, I have no idea how long it will last under water but I have high hopes
J**D
Expensive but effective
I used this to repair a tear in a pond’s liner. Having cut a small patch of liner about 20mm larger than the tear, I applied the sealant all over and around the tear then placed the patch over it. Allowed recommended 24 hours to cure then refilled the pond. Three days later it seems to have worked perfectly with no apparent drop in level.
S**Z
The reason I returned it ,is because it needs a primer for concrete and the specific primer for humid septic tanks is very expensive
J**Z
Good
J**N
Other than only available in black, this is an excellent sealant.
J**K
Our rubber lining seam had come open below the water line due to drought and the ground moving. When we realized that we needed help fast. This stuff worked perfectly. Caulked the open seam right in the water and pressed it closed with some rocks. The next day we could refill and the waterline didn't drop. We'll be buying more.
E**.
Arrived with no top. Several other reviews mention same issue.
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