Don't mess with me old man! You might break a hip or somethin.  You were talkin about something else and you know it. And fuk you too Kibb, don't encourage that old senile bastard.
Cabinets and countertops are made with particle board(used to be anyway, some newer ones do use MDF or something similar), which crumbles bad when wet and is made from sawdust and wood chips...MDF is huge sheets of paper, which may have been sawdust at one point, but it don't crumble like sawdust glued together. I deal with that shit everyday, and I deal with the South Dallas folks who have busted ass cars with leaking trunks. I've seen what happens to it when it gets wet, it swells. Once it gets swollen to a certain point, you can pull the sheets of paper apart, but it still doesn't crumble.
I've also seen that it does hold up pretty well with a good coat of quality bedliner. We've done some stuff for boats with cheap customers that didn't want to fork out the dough for fiberglass work. It holds up a lot better with bedliner than a coat of fiberglass resin for sure. The resin cracks.
As far as poly goes, that shit is EXPENSIVE! Anything thick enough to use for this shit anyways. It's harder to cut and put together also. They have special glue's and shit for it, but it's still harder to work with and expensive as fuk.
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I know MDF works good for truck or car speaker boxes, but they aren't exposed to the weather. We had a piece of scrap that got left outside one night & it rained. Shit swole from 3/4" up to about 1-1/2" overnight. We left it out to see how big it would get, & after it reached about 2", the ends started to kinda fray & crumble.
I just thought of something!!! Get ya some 1/2" polymer, water-proof, durable, & fairly in expensive. Get it in black & ya won't even have to paint it.
