The idea is to fill the form as much as possible with wood, this is facilitated by pieces of different sizes. Epoxy dates the effect of frozen water if it is crystal clear.
The resin must be evenly distributed so that it occupies all the spaces in the lower part of the mold and then dry well. Its quantity is calculated in an interesting way: the form is filled with sand, which is then poured out and its volume is measured.
Further, the surface is carefully sanded and polished, the result is amazing.