The marine should hold (assuming it bonds to the plastics properly). Marine resins can take 7 days to fully cure. It's worth noting that there are some pretty extreme carcinogens in marine rated resins.

I'm not sure what hardware stores have in way of hydro-friendly gaskets, but you might be better off just buying the General Hydroponics Waterfarm kit. It's only $12 and you can pretty much guarantee it'll work if you drill the right hole size and just hook it up to new tubing of the same size (take tubing to a Home Depot, they should have tubing of the right size). If you decide at a later date you want a drip rig, you're already part way there.

u/silas0069 · 1 point r/hydro

This is a complet waterfarm kit, just need a res and grow chamber It's not very expensive but good stuff still.

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