I am starting the body work on my 70 Barracuda. The panels are solid, but have a sizable amount of surface rust from sitting outside in the elements. I don't have access to media blasting and I am going to tackle this part of the body work myself. Is there a chemical rust remover that can be used and what grit sand paper should be use to remove the paint from the entire car. I will be doing a small area at a time and then spraying metal etching primer to those areas.