Blake what Barney is talking about is (guide coat)this will help you see what you are sanding.Problem with using spray bombs as guide coats is most of them are laquer based,and if not all of the guide coat is sanded off it can cause problems when it comes to painting.I like to use base coat or a graphite powder as a guide coat, both of these are compatable with the paint systems these days.One more thing ,filler will absorbe any moisture, keep all moisture away from filler unless you get some oil or heavey contaminates on an area,wash that area only and dry with air.When filler work is done prime immediately
