I'd see a problem if they went through "holes". Other than that seal it up with painters tape and you're good to go.
A tip if your trades are engraved. Cover the trades with painters tape and paint the rest of the gun first. Then paint the trades with a brush, wipe it off with a Kleenex or something (so the paint doesn't sit in the crevasses and fill them up) then "colour in" the trades with a crayon, or whiteout, and cover with a matte clear coat.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE