Hi, thank you.
Sorry for the late reply, I´ve used weathering techics that i´ve saw in youtube vídeos (search for sandtrooper weathering): -For the use of dirt or sand, search the tk4510decals vídeo, where he explains how to apply sand in the helmet (the process is the same for the rest of the armor)
-For the acrylic paint you can find the vídeos of panda86dk aka pandatrooper (This tutorial it´s pinned in this forum too).
The only diferent thing i´ve done, compared to panda video, was the use of Americana Acrylic Paint - Fawn. Applied with a sponge in great quantities but waited a few days to clean, using my hand and ethilic alcohol all over the armor, leaving the dry paint in the edges. For the sand, used 3m spray mount glue over some áreas of the armor, applied sand, used for dioramas, and after that, Americana varnish to fix the sand. But if you follow the vídeos you can see the whole process i´ve used.
This photo was taken in the beggining of the process, with the acrylic paint. I have repeated the process 3 or 4 times, because i don´t like too much dirt.
After this, i´ve used the sand. cheers
Luis M