Muriatic WILL etch the metal. It needs to be diluted a lot to be safe for the metal and then it works much slower than his results.
If you are going to use it, have a large enough tub to submerge the entire piece to avoid etch lines like I got soaking my fenders one side at a time. The etch will be uniform and if rough enough, supply the "tooth" primers want to grab the metal (substrate) That would eliminate needing to hand sand with 80 grit.
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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