Did a trial on some zimm on the foward areas of the hull this afternoon, I used 'no more nails' as its a hard setting acrylic paste that takes paint well and can be washed off as your putting it on, in case of some bad smudges. I did the ripple effect with a large gear wheel, easy enough on a flat surface like those, but the others are much trickier, have to work out a tool for those.

Just about to attempt the dreaded barrel mod, depending on how this goes, it may develop into a barrel extension mod too, I dont have anything to benchmark its performance aftwerwards though, as I have never tried the airsoft cannon....still...nothing ventured etc!