will it fix leaks in pool/spa glass block spill spillover, where mortar is leaking?

To my understanding it will and there have been many good reviews. I have not had that specific issue myself. The alternative is to remove the grout and replace. That is a very labor intensive. Hopefully this helps a little in your decision.

Will it seal drip at pipe joints

I would say it will not seal a drip in a pipe joint for any length of time.if the joint is soldered a plumber will have to re solder for a permanent fix.if the joint is threaded get pipe joint compound, unscrew the pipe, apply pipe joint compound to the threads and screw the pipe back onto the fitting.underwater magic is used to reattach tile in pools and fountains without having to drain them.it is not a long term fix product but will buy you time to fix the problem permanently.

I have a wooden bathtub and I keep a small amount of water in it, will this stuff help with small leaks where existing chaulk is failing?

without seeing the tub I can't advise you.i used this product to seal thin cracks in a plaster pool.it held for 4 months before falling out.it is very messy to work with and would probably not look good on a wood tub.a clear, waterproof silicone would be your best bet and you will have to reseal twice a year.

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Underwater Magic Sealant, Mosaic, 2.1 oz Tube, White

Product ID: 159957967

Details

Material
Silicone
Brand
Underwater
Style
Compact
Item Weight
2.1 Ounces
Compatible Material
Tile Grout

💧Water Resistant

🧪100% Silicone

☀️UV Resistant

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VT11150

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Sold byAmazon VanuatuDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌊 Dive into Durability with Underwater Magic!

COMPACT POWER - 2.1 oz of concentrated sealing strength.
SEAL YOUR DREAMS - Transform your aquatic spaces with confidence!
ULTIMATE PROTECTION - Resilient against salt, chlorine, and UV rays.
ECO FRIENDLY FORMULA - Solvent-free for a safer environment.
VERSATILE APPLICATION - Perfect for tiles and more!

Underwater Magic Sealant is a high-performance, 2.1 oz tube of white silicone sealant designed for underwater applications. It is resistant to salt water, chlorine, shock, and UV rays, making it ideal for pools, spas, and other aquatic environments. The eco-friendly formula is solvent-free, ensuring safety while providing exceptional adhesion and durability.

Specifications

Item Weight	2.1 Ounces
Color	white
Style Name	Compact
Surface Recommendation	Tile
Water Resistance Level	Water Resistant
Item Form	Liquid
Material Type	Silicone

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