Leave the latex sitting in the mould for a couple of hours, i usually throw the heater on in the workshop on low and leave the mould close by, then empty it back into the container and leave the mould up ended to drain for a half hour or so.
I then leave it overnight and then powder and pop the mould apart works a treat for thick castings
If you want it to dry quicker i usually put a hairdryer in the open end and leave it for an hour or so, checking it every ten minutes or so to see its not getting too hot, i leave it on a warm setting, not on full, this quickens up the drying time, but is supposed to weaken the finished casting, i have never had a problem with doing it this way though.
Hope this helps
The longer you leave the mould filled with latex the thicker the casting will get, the plaster obsorbs the moisture out of the liquid and leaves a buildup of rubber on the surface on the mould
I then leave it overnight and then powder and pop the mould apart works a treat for thick castings
If you want it to dry quicker i usually put a hairdryer in the open end and leave it for an hour or so, checking it every ten minutes or so to see its not getting too hot, i leave it on a warm setting, not on full, this quickens up the drying time, but is supposed to weaken the finished casting, i have never had a problem with doing it this way though.
Hope this helps
The longer you leave the mould filled with latex the thicker the casting will get, the plaster obsorbs the moisture out of the liquid and leaves a buildup of rubber on the surface on the mould