answer:Should do fine. I’d rough-sand the existing paint first, then tack it clean with a damp cloth before painting. Give the paint something to stick to. For funsies, here’s a video of a guy taking a hilarious amount of time taping off his entire kitchen with newspaper to spraypaint his range hood, in an effort to avoid the ten minutes it would have taken him to unscrew the thing from the cabinet. Thing looks nice, though.