I have 50 lb boxes of Rock hard Water putty used in making realistic Extra hard rocks that are light or hollow for taxidermy habitats.
I also have rubber rock molds that are flat on the back so you can make all the rocks or rock backing for wood stoves or fireplace mantles or ??????
You can do Hundreds of rocks from each mold.
These type of rocks are colorable so you can match any color scheme.
Email me at firstname.lastname@example.org for prices & orders
PRO Taxidermy Fairbanks
907 322 0936