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

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

💧100% waterproof underwater seal

☀️UV & shock resistant durability

🌡️Temp resistant -40°C to +100°C

$58.36

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Description

💧 Seal the moment, fix the future — underwater magic at your fingertips!

VERSATILE APPLICATION - Perfect for mosaic tiles, grout, concrete, and metal in wet or dry environments.
COMPACT READY TO USE - 2.1 oz tube designed for quick, precise small repairs without mess.
RESILIENT AGAINST ELEMENTS - Chlorine, salt water, UV, and shock resistant for long-lasting poolside performance.
SAFE ECO FRIENDLY FORMULA - 100% silicone, solvent, oxime, and isocyanate free for peace of mind.
UNMATCHED UNDERWATER BONDING - Seals and repairs tiles underwater with professional-grade adhesion.

Underwater Magic Sealant Mosaic is a compact, 2.1 oz professional-grade silicone sealant designed for small underwater repairs. It offers superior resistance to chlorine, salt water, UV rays, and shock, maintaining strong adhesion across tile, grout, concrete, and metal surfaces. Safe and solvent-free, it withstands extreme temperatures from -40°C to +100°C, making it the go-to solution for durable, hassle-free pool and wet area maintenance.

Specifications

ASIN	B07WV6JZMD
Best Sellers Rank	#116,127 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #165 in Pool & Deck Repair Products
Brand	Underwater Magic
Brand Name	Underwater Magic
Color	white
Compatible Material	Tile, Grout, Concrete, Metal
Customer Reviews	3.8 out of 5 stars 103 Reviews
Item Form	Liquid
Item Weight	2.1 ounces
Manufacturer	Underwater Magic
Material	Silicone
Material Type	Silicone
Model	MOSAIC-60-ea
Number of Items	1
Number of Packs	1
Part Number	MOSAIC-60-ea
Style	Compact
Style Name	Compact
Surface Recommendation	Tile
UPC	658848337316
Unit Count	2.1 Ounce
Water Resistance Level	Water Resistant

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$58.36

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

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TrustScore 4.5 | 7,300+ reviews

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