Dupes- I use Suave "Max hold" 8, 2 coats applied 10 minutes apart, applied over a Model Master gloss coat that sat overnight. The hairspray was dry to the touch and could be handled when the white was applied. I also went a little heavier with the white in the areas that I figured were going to be less trampled so it would still wear a bit but not come completely off. The polly Scale was thinned 4-1 with water and sprayed. It'll be a bit more transparent, which to my eyes already showed some age. Started on the hull then moved to the turret, (which was detached, taped to a water bottle.) The Polly Scale dried fairly quick so just about the time I was done with the turret I came back with a #10 "fine shader" stiff brush, damp enough so that the surface of the white could be moistened in the spot I was going to work, and started wiping at the white, working in the same direction, which was towards the bottom of the tank. It only took a few seconds for the water from the brush to start softening the white, and the hairspray and start breaking it apart. I used a paper towel to dab at the paint and hairspray to remove the excess as I went along. The areas that would see less wear and have the whitewash remain were just brushed over with the brush being barely damp. Still wore it a bit, just didn't break it apart.
I had planned to take pics as it went along, but I'd heard some horror stories about the whole thing setting up too much and not releasing. It's also the main reason I started working the white so soon after applying, didn't give it much of a chance to set up much.
Hope this description helps out Dupes. Kinda went a bit "long winded" on it. Can't wait to see your Panther, any pics in progress?
Dale