This is what I do and I drive my car all year round and park it outside with no rust (well I cleaned up what was there when I got it and no more has formed)
1. spray paint the bottom
2. Rubberize it
3. Here's the killer: Douse the underside with tire silicone (the kind that comes in the pump bottle). It will make this thick heavy film form on the bottom of the car and it's great for keeping the water and salt off. Plus...you can squirt it everywhere. I have this stuff inside the fenders, inside the doors. Not a spot of rust
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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