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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Sealant, 290ml/9.8oz Tube, White

Product ID: 582321256

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Details

Brand
Underwater
Item dimensions L x W x H
23 x 5 x 5
Item weight
0.01 Ounces
Material
Polyurethane
Style
Compact

⚡Fast-setting sealant for underwater use

💧Waterproof polyurethane formula

🛠️Compact 290ml tube for precise application

Description

💧 Seal the moment, dive with confidence!

VERSATILE USE - Perfect for sealing underwater camera housings and accessories (except vinyl)
TRUSTED SINCE 2023 - Cutting-edge sealant technology from Underwater Magic
COMPACT CONVENIENT - 290ml tube designed for easy handling and precise application
FAST SETTING FORMULA - Quick curing to get you back underwater faster
ULTIMATE WATERPROOF DEFENSE - Seals underwater gear with professional-grade polyurethane

Underwater Magic Sealant is a fast-setting, waterproof polyurethane sealant in a compact 290ml tube, designed specifically for underwater camera housing accessories. Lightweight and easy to apply, it ensures a reliable seal for your gear—just avoid vinyl surfaces. Available since April 2023, it’s the go-to choice for professionals who demand durability beneath the waves.

Specifications

ASIN	B01NCUU1N1
Batteries Required?	No
Batteries included?	No
Colour	White
Date First Available	24 April 2023
Item Package Quantity	1
Item Weight	0.28 g
Item model number	UWM-01
Manufacturer	Underwater Magic
Material	Polyurethane
Part number	UWM-01
Product Dimensions	22.99 x 4.95 x 4.95 cm; 0.28 g
Style	Compact

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