I knew this question had do be asked in here somewhere and BEHOLD i have found it! The magic question of how much... I'm about to media blast my 73 Mach 1 sometime in the next couple of weeks (yes i'm doing it myself) and I want to get some primer on there as soon as I have the metal all prepped. My plan of action is to use SPI epoxy primer after the metal prep (soap wash, grease/wax remover, Ospho rust inhibitor, sit over night, Ospho again (to remove the dry Ospho), grease/wax, 80 grit sanding, damp cloth wipe down, primer). I'm thinking about first hitting it with red, then after the flash time passes get it with 2 coats of black. The main reason would be so I know where I'm at during the block sanding process so if i'm getting too close to bare metal I see red and know it's time to STOP! The black coats will highlight any imperfection in the metal (in theory) so I can see waves, high spots, dips blah blah blah before I get to the point of using a guide coat. And, I get to see what it looks like in red and black to help me with what color final paint will be... Anyway, back to the original question of how much of each would I need for the whole car? I'm guessing a quart of red (plus the catylist at 1:1 mix so 2 quarts sprayable) and a gallon of black (plus the catylist again so 2 gallons sprayable). Does that sound about right? I'm media blasting and hitting the epoxy BEFORE any metal work is done so I know there's going to be a bit of waste and re-primer in the mix. I plan on buying individual quarts as I go along at that point but as of now.. that's a ways off in the future. Anyway, I appreciate any insight and direction you guys want to give.