Not 1:18 related but it's what I've been working on for the past 2-3 months with the spare time that I've had:
These were my first foray into dry-brushing, doing washes, and using a sealant. After Miked assured me that he never had an issue with Testors Dullcote causing the soft plastic to become tacky, which I've read can happen, I gave it a shot. The results are amazing, as I none of the soft plastics turned out tacky.
The only thing left to do is their weapons. I had Leo, Raph, and Donnie's weapons painted and sealed, but the paint still came off of the hilts when I placed them in their hands. So, I'm going to have to redo them. I think I'm going to use Testors semi-gloss sealant on the weapons b/c it seems to be stronger and more durable than their dullcote. I used the semi-gloss on the blades of Leo and Raph's weapons and none of the paint came off when putting the swords in their sheaths, when putting the sais in their "holsters".