Reply to "Sculptamold and static grass"

@Mike CT posted:

Joint compound sticks to most surfaces.  Unfortunately, applied more than 1/8" to 1/4" thick, it doesn't dry/harden well.   Recent repair I purchased a 45 minute set, joint compound mix.  Has to be mixed with water, total time mix and apply, before it stiffen is 45 minutes.   

I've found that you can layer it, wet over dry, to get much greater thicknesses.  Only problems are 1. it's way too heavy and 2. it chips easily.