I am not quite sure what you are asking. If you have already primered the trim pieces, then just fill with poly filler sand and reprime and shoot your color coat. I did my trim pieces last summer, and just made sort of eyelet shaped seperators out of bailing wire. I used pressure fit wire shapes to keep the ends apart. Plus, useing an eyelet instead of a hook you keep the surface area being not coated to a minumin. Hope this helps.
