[dsraven]

one little trick I have found to work well for finding the pinholes is to use a light on the back side and then look for bright spots. then when that is all fixed and you can't find any more bright spots then soak the area liberally with some wax and grease remover and look on the back side for any wet/damp areas. the bonus to this is that you will also see the reflection of the surface, which is very close to the contours you will see when it is painted. if it looks ripply, and you want smooth, you have some body work to do before rechecking for pin holes.