Im getting ready to re finish a few metal areas in the interior of my 69 pontiac. When I repainted the pillar post covers I sanded cleaned and primed them with no problems. However, when I painted them with a fairly good quality automotive spray paint i got patches in several areas where it looked like the paint would not totally adhere. I re did these several times and finally got an acceptable job, though not perfect. Before I start on other areas such as the steering column—what am i doing wrong?