Originally Posted by
superhappyrobot
I've used the weathering stick. I was unimpressed because it looked like globs of wet mud, but if that's the look you're after, give it a try.
For the most part, the weathering powders stick to the model after the thinner/medium you used to apply them dries, but if you want to use powders on serious gaming minis, then you definitely need to seal the mini (probably with a matte sealant, as glossy would look a bit off). I usually do powders last, typically after painting the mini and base, but before adding static grass. I hit the model with matte varnish after the thinner evaporates, and then I add the static grass on top of the varnish.