Eastwood internal frame coating is your friend.
https://www.eastwood.com/eastwood-in...z-aerosol.html
Not sure if spraying undercoating in the frame rails is a good idea, you won't get good coverage, and it might hold water.
Very nice work!
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
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1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
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