I use a self etching rust inhibitive primer, then a high build urethane primer. You can get them both in a spray bomb. The self etching primer bites into the steel. The high build fills in the sand scratches etc. The high build primer in a spray bomb has a glass ball inside with the activator in it. When you shake it the glass breaks, Then the primer drys / hardens with a chemical reaction not by evaporation of reducers. The only problem with this is you have to use it all or its no good in the can later. I have also recently used a roll on high build urethane primer by Transtarr. It works really good. Rust converter only works on rusty metal, I wouldn't put rust coverter on clean metal. It won't help anything.
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