<blockquote><font size="1" face="Verdana, Arial">quote:</font><hr>Originally posted by kmcormick9:
true, but i want to be able to leave my top down without worries, and eventually eliminate the top altogether. along with my vinyl, i plan to use boat carpet. its mildew resistant and it usually has some sort of waterproof backing<hr></blockquote>
All that is true, but you're only keeping the carpet and seats looking good while the metal is rapidly deteriorating from moisture retention.
Using a waterproof carpet may help keep the water out of the floor, but it may also keep moisture trapped between it and the metal causing corrosion (rust) to grow rapidly. This is especially true if you're laying the new carpet down in pieces as the moisture will no doubt find its way between the seams.
If you have your mind set on a waterproof tub you'd be best to pull every bit of the interior out (dash included), strip and blast the interior, followed by some metal treatment and a good solid coating of POR-15. That should at least offer a solid contiguous waterproof surface that should protect the metal. Once your "waterproof" carpet is installed (with drain holes) any moisture trapped under the carpet shouldn't hurt the POR-15 treated metal.
Of course none of this offers any protection for your dashboard and electrical system. To achieve the perfect "topless all weather car" you could replace all the switches in the car with watertight switches, retrofit the ignition switch assembly with a watertight version of some kind, seal all the connectors so they don't corrode, and leave the radio out.
I realize you're probably just trying to set the car up so if it gets wet accidentally it'll be fine, but I'd suggest that keeping the top on the car and putting it up when the weather is iffy will result in better long-term protection than just changing the seat and carpet material.