The resin rain drops were sculpted first in clay and from each one a vina mould was made. I could have used styrofoam instead of clay but I preferred to use a more natural material for the bumps and scratches and indentations basically I didn't want it to be perfect.The resin is mixed with the catalyst and poured into the mould.The resin cast are allowed set for a number of weeks then sanded and polished.