Prepping plastic models
by Laurence FX
I never heard of anyone lightly sanding a plastic model to help paint adhesion. The best thing to do is to carefully wash the plastic parts in water and a little liquid detergent ( preferably Dawn). This removes the release oil sprayed on the molds before the plastic is injected. Sanding may erase the fine details on some models i.e. rivets, panel lines etc.
A primer is also recommended for most models but don't get too heavy with the paint as this will cover up fine details also.
SMH Responds thanks for the tip. Your idea sounds a lot less messy.