Are these sturdy, good quality?

Works great sealant stopped the slow leaks.

can it be used with pvc mesh - ie "collapsable" rain barrels - to re-seal the seams?

I don't believe so - there is a warning on the label that says it doesn't work well on seams.

Will it work for an inflatable hot tub?

Sealant will cure pourosity problems (pinhole leaks) on any inflatable item

Will this clog the pressure release valve?

No. when you re-inflate the air chamber any Sealant on the valve will blow off. As a precaution you can have a wet q-tip handy to swab the valve .

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Description

🛟 Keep your adventures afloat—seal leaks before they sink your fun!

TRUSTED SINCE 1986 - Backed by decades of 5-star ratings from West Marine, a sealant you can rely on.
ENDURING DURABILITY - Formulated to create a tough, long-lasting bond that withstands years of use and storage.
LEAK PROOF CONFIDENCE - Seals from the inside to prevent slow deflation, keeping your inflatable boat ready for action.
EFFORTLESS REUSABILITY - Apply multiple times to tackle persistent leaks without replacing your entire boat or raft.
UNIVERSAL COMPATIBILITY - Perfectly designed for inflatable boats, dinghies, rafts, kayaks, and towable water toys.

Inland Marine USA Inflatable Boat Sealant is a specialized formula that stops slow leaks from inside your inflatable watercraft. Trusted since 1986 and highly rated by West Marine, it creates a durable, reusable bond that prevents deflation and extends the life of dinghies, rafts, kayaks, and towable water toys.

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