Did anyone see on the Humbrol YouTube channel, the weathering of rolling stock by pigments, where rust pigments were fixed by Humbrol Matt Cote thinned with Humbrol thinner, then later reactivated through chipping of the topcoat, to appear as rust chips with rust streaks? This technique seems to be unique to Humbrol, and shows much promise. But a 28ml of Humbrol Matt Cote is $34!! I'm checking if someone knows the chemical equivalence to the product here in the states, that hopefully would be less expensive. Thanks.