@prrhorseshoecurve posted:Krylon flat clear.
@Bob posted:I agree. Specifically, the one I use is Krylon Colormaxx "Flat Krystal Clear."
I concur. I have used both Krylon Gloss Clear and Flat (Matte) Clear for decaling and/or dulling finishes with great results. Admittedly, the stuff stinks, so you either should have a spray booth w/ exhaust fan or else do it outdoors.
Testor's Glosscote and Dullcote are great products too, but a long time ago I got tired of occasional availability issues and the high prices of the little spray cans.