I’m looking for a little help on using epoxy primers. I have always used lacquer primers, but my local paint shop convinced me to try epoxy primer (I’m working on a 66 mustang right now). It goes on okay, but it seems like no matter what I sand it with – 180 up to 400 – it just gums up the paper (dry sanding – I haven’t tried wet sanding it yet). I’m going to go back to the paint shop and see what I might be doing wrong, but I thought maybe one of you folks might know. By the way, it’s PPG.