There is one thing not mentioned here, in getting some machine ready for paint, and after sand blasting and sanding! DON'T forget to blow out all of the nooks and crannies as that's where the dirt, dust, and sand blasting stuff lurks! And also, wash (as in clean rags) with a good cleaning product for pre-painting operations, using clean rags, or towels. The clean towels, or other things might leave a bit of lint or dust in the cracks, So another blow off is seemly. If your compressor is old, one of those little ball shaped filters, at the gun end of the air hose will catch most of anything coming from the compressor. But, they won't catch old polishes,oil, wax, etc. Always use a "Tack-rag" right before spraying. available at auto paint stores, and others. Great for small pieces of dust, etc. that may remain before paint work begins! A good practice is to wash the original surface before any work is done, with Prep-sol, or any product for that purpose. then go to the rust removal process and any surface sanding, priming of repairs and final sanding and blow off. Then do the final wash again, tack the readied surfaces again, then apply the finish coats. Always do the things that will produce the best results, before you begin to apply the paint! And---DO NOT use gasoline to wash the surface prior to applying any paint products! If you do--you will end up with a coat of livered paint, which will require a complete removal of all of yer hard work! And--a mess that will make you want to blow yer brains out! Seen that!