how do people get their cars primered and drive around with them for months before they paint them. I see it all the time. BUt I keep looking for primers to do my car with but they all say they will begin to bouble after about 3 weeks. I wanted to primer my car black and get the body work done until I could afford to get it completely painted. I need high build primer. I was going to use ppg k36. But now I am having secon thought. I am planning to do some filler work this weekend. Should I use spraypaint over it to seal it up because the car will be outside. Will spray paint seal up filler spots?