Hey guys i was wondering what primer i might use with this product, i bought this stuff to use on small areas , as i work on them , i thought it would be cheaper, but at 13 bucks a can, having used more than 20 cans i now have a pretty pricey paint job,i need a primer i can mix in small batches, then when im done with body work, do a final sanding and spray color, also heres a pic of the filler im using