This product can be applied underwater? Or does it have to be applied and cured on a dry surface first?

Yes, can applied under water. I got piping that have very small water leaked that is why I bought this one. I applied and it seems it stop the leaked up to now. Hope this helps.

can this be used to repair a cracked skimmer?

I would give it a try. I used to repair a leaky exhaust port on a motor yatch.

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Underwater Magic Sealant, 290ml/9.8oz Tube, White

Underwater Magic Sealant, 290ml/9.8oz Tube, White

Product ID: 41353198

Details

Brand
Underwater
Item Weight
0.27 g
Item dimensions L x W x H
9.05 x 1.95 x
Material
Acrylic
Style
Compact

🌊Seals underwater flawlessly

🧪Chemical & chlorine resistant

🌡️Temp resistant -40°C to +90°C

S$109

Duties & taxes included

In stock

Sold byAmazon SINGAPOREDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌊 Seal the deal above and below water with magic-grade strength!

TEMPERATURE TOUGHNESS - Withstands extreme temps from freezing -40°C to scorching +90°C, even brief spikes to +200°C.
ECO FOOD SAFE FORMULA - 100% silicone-free, solvent-free, and safe near food areas—perfect for pools and kitchens.
USER FRIENDLY ODORLESS - No mixing, no harsh smells, and fits standard caulking guns for effortless application.
CHEMICAL CHLORINE SHIELD - Resistant to saltwater, chlorine, oils, and harsh chemicals for lasting durability.
UNMATCHED UNDERWATER PERFORMANCE - Seals leaks and bonds underwater with commercial diver-grade reliability.

Underwater Magic Sealant is a professional-grade, 290ml waterproof adhesive designed for seamless underwater and above-water repairs. Its advanced acrylic-polyurethane formula resists chlorine, saltwater, chemicals, and extreme temperatures, while remaining odorless and easy to apply with standard tools. Trusted by commercial divers and perfect for pools, boats, and wet environments, it delivers permanent elasticity and abrasion resistance without silicone contamination.

Specifications

ASIN	B01NCUU1N1
Best Sellers Rank	#73,679 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #280 in Hardware Sealers
Brand	Underwater Magic
Brand Name	Underwater Magic
Color	White
Compatible Material	[Most Materials, Excluding Vinyl]
Customer Reviews	4.2 out of 5 stars 71 Reviews
Item Dimensions	9.05 x 1.95 x 1.95 inches
Item Form	Gel
Item Weight	0.27 g
Item dimensions L x W x H	9.05 x 1.95 x 1.95 inches
Manufacturer	Underwater Magic
Material	Acrylic , Polyurethane
Material Type	Acrylic, Polyurethane
Model	UWM-01
Number of Items	1
Number of Packs	1
Part Number	UWM-01
Style	Compact
Style Name	Compact
Surface Recommendation	Tile, Concrete, Plastic
UPC	712190587963
Unit Count	9.8 Fluid Ounces
Water Resistance Level	Waterproof

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