Deuce roadsters are available in steel from real steel rod bods and brookville but for something like a 39 ford repro body fiberglass is your only option.
Fiberglass over sheet metal.
However fiberglass tends to crack when stressed and warp when heated.
Pound for pound fiberglass is stronger than sheet metal.
Wipe the ground area of the metal clean with a rag and acetone.
Fiberglass is a non corrosive material that can be used as reinforcement or as a repair patch on almost all surfaces including metal plastic and wood.
Rough up the metal surface with a piece of coarse grit sandpaper.
Fiberglass will not and enthusiasts shamelessly plug their favored car body s corrosion resistant feature.
Lay the fiberglass.
If bonding fiberglass gelcoat rough that up too.
How to fiberglass over metal step 1.
It will vibrate and the bond to the fiberglass will loosen.
Not really thin sheet metal.
Fire retardant resins can make your products stand up against fire and will only char not burn up.
Perfect for products used outside in states near the ocean with the high salt content in the air.
Metal while still incredibly strong is easily repairable and advantageously moldable when heat is applied.
Roughing up the surfaces give the epoxy more surface area to bond the fiberglass to the metal.
Yes surface prep is everything and the exact method depends on if you want to remove the sheet metal.
Typically fiberglass is used for rust repair by replacing the rusted metal and sealing the surface.
Fiberglass has a high resistance to corrosion it will not rust.
As kenny from brookville points out.
Grind the area of the metal that will be getting fiberglass applied to it using an air grinder.