Can this sealant be applied to a pond or aquarium while it’s filled with water, or must the surface be dry first?

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.

Will the sealant bond effectively to a wide range of surfaces like wood, metal, plastic, stone, and glass?

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.

Once the sealant is fully cured, is it safe for all aquatic life, including koi fish, turtles, and amphibians?

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.

Is this suitable for sealing bathrooms, kitchen sinks, or windows where strong waterproofing is essential?

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.

Will this product stay flexible after curing, especially when exposed to outdoor temperatures and movement?

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.

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🌟 Seal smarter, not harder — the ultimate fix for your aquatic oasis!

EFFORTLESS DIY UPGRADE - Compact 300ml tube designed for easy handling and professional-grade results at home.
RAPID UNDERWATER CURING - Get your pond or aquarium sealed in just 24 hours, even underwater—no downtime needed.
VERSATILE MULTI SURFACE BONDING - Bonds flawlessly to concrete, glass, metal, wood, and more for all your DIY projects.
FISH SAFE FORMULA FOR PEACE OF MIND - Protect your aquatic life with a sealant that’s safe for fish, plants, and reptiles.
UNMATCHED STRENGTH FOR LASTING REPAIRS - 4x stronger than traditional silicone for durable, worry-free sealing.

MyPond MS300 is a premium marine-grade MS polymer sealant that delivers 4 times the strength of standard silicone. It cures underwater within 24 hours, bonds to a wide range of materials, and is safe for fish and aquatic environments. Ideal for sealing leaks in ponds, aquariums, fountains, and windows, this 300ml compact tube offers a reliable, fast, and versatile solution for both DIY enthusiasts and professionals.

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Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

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Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

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Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

S$55

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TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

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Manufacturer	MyPond
Part number	Ms-300
Item Weight	449 g
Package Dimensions	32.89 x 5.69 x 5 cm; 449 g
Manufacturer reference	Ms-300
Style	Compact
Material	Silyl Polyether Polymer
Batteries included?	No
Batteries Required?	No

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

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