So, up till now I did all my weathering with paint & washes. I got ahold of some good weathering powders and I'm about to start using them. I've also experimented with custom printed decals and I plan to use decals a lot more too for lettering, etc, but I don't want them to be all crisp & perfect I want them worn and scratched up.
So first, what are some good techniques for weathering decals? I read somewhere that fine sandpaper works good, but I don't want to just rip the decal off, and I also don't want to sand off my paint job. So, would I varnish / dullcoat the model first, then add decals, then dullcoat again, then sand? And then what about adding the powders? Before decals or after? I would think the dirt from the powders should be on top of the decal, but if I sand the decal, i'll sand off the powder too. So, do I do 3 layers of varnish? Varnish, then decal, then varnish, then powders, then varnish? seems like a lot of steps

maybe I can skip the middle varnishing, but wouldn't the alcohol I use to apply the powders have a chance of making the decals come off?
just looking for some ideas & tips