Primer to use
I have used several kinds of primer-surfacer. If you are lookn for a really high build you must not apply to much or it will crack after time and your paint job will suffer. I presently use UTEC primer surfacer. It isn't to expensive and it fills real well. If you are spraying it over filler you should have your filler final sand at least no courser than 180 grit. Apply 4 coats evenly and when you block it out you should have about 2 coats left on the car. If the car is clean with no filler work you can sand with 240 grit and apply 2 coats. Block it with 320, seal it and paint it. Oh...The primer surfacer is a urethane primer surfacer ( 2 part primer). You should be able to buy it at most automotive paint suppliers. I hope this helps you out.
