Its a mystical art form Bob, the resin or pitch remains a liquid albeit very very stiff.
If left alone it should flow, again, very very slowly like over months.
The plaster was to be the substrate for the resin, this time I'm using plywood.
I didnt have sufficient caster oil to allow the cold resin to flow so I'm adding more with a more vigorous testing regime before I pour it.
The channels and scratches in the face of the resin was supposed to allow it to flow and conform easier but it was too stiff.
I could have warmed it to let it flow easier but then it wouldnt re-conform as it polished.
This stuff sticks to cling film like the proverbial to a blanket.