i have a can of clear auto spray paint that says gloss, but its matte. one option you could do it to top coat with what ever you normally do...epoxy, auto clear, whtever. then go to a place like michaels, a.c.more they have a spraypaint section. pick you up a can of matte clear. if the bait is already top coated it cshould take much to to cover it in matte