how can you tell if headers are repairable or not?


what is too much rust ? I'm looking to buy some used mac mids but I need to know how to tell if its even worth trying to restore them..


since the mac mids are so cheap I plan on just ceramic coating them.. and sandblasting/steel wool/sandpaper whatever it takes to get the surface ready for ceramic coating.. and make them look good..


how much rust is too much?