Main Hatch water proofing

[abl1111]

Thats what I have ! I actually have a big rubbermaid container that I slice the top 4" off with a grinder - does a quick, clean job - no cover. I use it to store my anchor and line ( always wet ) or any fish I catch.

I'd love to make it an insulated cooler for fish - but want it to be pretty well sealed 1st. In a perfect world, I'd cut the old box out of the floor - insulate all around it on the outside - reinstall with some sort of channel/gutter to direct water out of box. Use a macerator to pump out water, ice, slime 'n scales.