problemdog

I don't have personal experience with it myself for weathering armour, but some art supply stores sell 'natural sponge' or faux natural sea sponge, which used with acrylic (and building up in layers) might make weathering effects look more natural just due to the irregularity and variety of the sponge textures? May also work to scrub away some already applied weathering. Could be an experimental option, if it hasn't been tried before?

What level of weathering would be suitable for boots? It looks like in the film theyre treated with the same black spray effect as the armour, but would a slight muddied look be fine talking in regards to 501st standards?