Don\'t do it!!! i can\'t stress enough you can not risk doing it like this, plaster heats up as it dries and you could end up with a bad burn, you will also trap every hair on your hands and arm into the plaster, plus you will have to smash it off to get the mold off your arm.
You need to get hold of some dental alginate and use that with a plaster bandage jacket.
You need to get hold of some dental alginate and use that with a plaster bandage jacket.