reggie,
It's been a while since I helped on a project like this, but I assume you are going to start by building a wooden box to contain your project. I'm not sure how Future would react to long term contact with water. I do know that other brands of floor polish tend to get soft and eventually dissolve if continuously submerged in water. If you think about it , most floor waxes or polishes are applied over surfaces which are already waterproof (linoleom, plastics, or varnished wood.
Having said that, I would build my container out of plywood, cutting, fitting and sanding the surfaces until I was satisfied. Then, I would paint all the surfaces with spar varnish (which is definately waterproof), making sure all the surfaces get a minimum of 2 full coats (dry between) and probably 3 to 4 coats. When dry, I would assemble the box, using good quality carpenters glue and nails or screws (which I would use). Wipe any excess glue from the joints and let it dry. Then give the interior a couple more coats of spar varnish. The box should now be water and leak proof although if you really want to be sure, apply a layer of silicon seal to the joints, smoothing and fairing it in with your finger.
I believe I read in one of the threads that you frequented an Ace Hardware store. They should have the spar varnish, carpenters glue and silicon seal. (BTW, Elmers Carpenters Glue - the yellow stuff, not the white - is waterproof when dry)
No matter how you go about it, good luck on your project