I will keep it in mind thanx.
The tracks on the sherman was also a black soft plastic of sorts, I did have quite a hard time when I put them on that the mud fell out in places where it bends.
I primed them with tamiya primer and painted with enamels, dried completely and does not feel tacky, it is very hot and dry here or maybe I was just lucky!
Even when I had to stretch them a little to get over the wheels, they did not feel like they were about th crumble.
The tracks on the bradley is also the black stretchy plastic and feels nice and plyable sofar. However I will heed your warning and do this Irak Bradley with acrylics, maybe the weathering will als stick better.
Theuns