This is so ironic, I took a long sabbatical from modeling, so long known of these techniques were available, I was thinking today how do I learn these new techniques? And hear your video pops up. I can hit the craft shop and get some paints and start practicing on some of my old " paint mules" . Thanks for sharing.
No specific time frame. It depends on what other weathering techniques I plan to apply. If I plan to do some chipping or streaks with oil paints, I will leave the gloss coat. I usually do a matt coat when I want to use weathering powders and color pencils as they need some texture to bit into.