In several threads I have seen what appears to be models in the sanding/filling stages of builds in which the panel lines have already had wash applied. I believe I understand the concept to be that you are able to check your work before painting and having to correct issues further down the line. I am working on the HK B-17G (later will be an F as well), I haven't built many models at all so this was a definite trial by fire but I think it is pushing me and it's turning out better than I anticipated so here I am. Sanding/filling stage. I want to repair bad mold lines as well as self inflicted ones from joining parts. I suppose my question being is should I put a thin oil wash on the bare plastic or should I put down a clear coat to bare plastic first much like it would after paint? My only goal is to see the lines to check the work, and most likely more sanding/scribing/rivets to come. I will be painting this one aluminum and going back again with possible post shading and weathering. Would oil wash on bare plastic cause adhesion issues to enamel based metallics later down the line? Is this even a necessary step or are there other ways of catching things before paint? I know primer shows issues but I need as thin of finish as possible. Any and all ideas, criticisms and general chit-chat welcomed. I am going crazy worrying from step to step and probably over analyzing these steps. Thanks for reading.