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With all that work, couldn't you just leave the undercoating off? I know this is a purist resto, but it seems a shame to spray that crap on the car - especially when the car will probably never be driven much anyway. Someeone could always spray that stuff on in the future if they really wanted it.

you must spray it in,or you will have little dents pop up thru the fender(from stones) and will show on top of the fender,I always lay on heavy there just to make sure the fender is protected