I would resand the whole thing again with 400 sandpaper to get the whole paint off. then then primer it again with rustoleum ligh gray primer.
then sand it again with a 600 grit. then primer it again. then sand it with a 800 grit.
It seems like alot to do but its very much worht the results.
The thing you want to accoplish is to almost have a shinny primmer surface to the rubb and buff to attach on.
Remember when your R&Bing you want to do a whole piece at a time. dont do sections. paste a bunch of dabs all over one piece then rubb it over then press really hard with your hand to generate heat to melt the wax on the the piece.
Remember to work fast. do it like a mad man. thats why you have uneven parts cuz this stuff dries quickly.
ulso dont mind the dull parts. remember that this suit is supposed to be nice and gritty looking.
remember that R&B is a wax and it needs to be melted down to a surface or it wont ever dry. The harder you buff with your hand the better.
sircular motions on every piece.
here's a picture of a well beat up jango chest piece.
see how messy it looks.