I use halfords plastic primer and camo range paints but I also use rusterol forest green textured paint for it's grippy surface.
Key the plastic parts and degrease, use the primer and then the rusterol textured paint, spray over with the halfords tan camo and then camo green then brown.
I use fern leaves and bunches of grass as camo stencils.
Very rewarding to see the results as I did this on my tm vsr.