I am going to have to completely replace the floors in my 68 coupe, After I have succesfully made sure there is absolutely NO rust under the car nextis paint etc, a LOT of the roads around me (im building a driving car not a show queen) have loose gravel etc, that will chip the paint on the underside of the car, so Id like to find the hardiest means of preserving the cars underside. A guy I work with owns a business on the side, he will cheaply coat the underside of the car and wheel wells with an industrial coating like rhino liner. Is this a good or bad idea? it would be very tough and perent rusting in the future (from the bottom anyway) This is a NASTY experience with the rust thats under the car now, I DONT want it to ever start again.