N scale, HCD layout. Have all of the foam carved, sculpted and want to begin adding rock castings. I have made a lot of them in plaster-of-paris and will have to blend them into the foam sculpting with either plaster or joint compound after they are added. My question, is it best to go ahead and add them in their raw, unfinished state and then paint/stain them after the ground covers and so forth are applied or should I try to sort of prefinish them before adding and then do the final finish after the ground covers are applied. This probably doesn't make a lot of sense but I have never done this before. Since it will take a fair amount of blending them into the foam faces, especially in the curve areas, if I was to prefinish, they would really get messed up with the plaster or compound and then have to be "refinished" again anyway. Probably best to just go ahead and glue them on and finish them in place, right? I'm learning but this phase is not going to well right now. The trials and tribulations of being a newbie.