Hopefully charger see's this message now. I asked before but it seems lost

Hey charger i went and painted my car, and it looks great now compared to the black/grey oxidized 240sx i had before. Before, I thought my body was pretty straight, few dings here and there and i thought it would be fine. I guess it was the color that hid everything so well. Now after painting, i see the dings. I was able to paint my car now because of spring break, but now I want to fix my body work up during the summer. When I want to fix my body with body filler, do you think I should sand down to metal, or just sand with enough grit so that the body filler can grab onto paint. What do you recommend? Thanks