07-21-2011, 08:09 PM
Or try a coat of Dullcote or other appropriate matte finish, followed by very light dustings of grimy gray chalk. Just mask over any parts to remain shiny...if any, as may be the case with those grimy engines in your photo! The initial dullcote provides an even 'toothy' surface for the chalk to grab and subsequent coats will seal and adhere well. Just let the dullcote dry fully between chalk applications in order to see if the color is really what you want.
Galen
I may not be a rivet counter, but I sure do like rivets!
