Be Careful When Using Plaster of Paris

poliss · Be Careful When Using Plaster of Paris

Plaster of Paris is frequently use for making scenery, but beware, it sets very quickly. It can go from liquid to rock solid in seconds, (it did when I was making a mould for my full size Dalek dome).
It also generates great heat when setting. Recently a schoolgirl lost 8 fingers/thumbs after the plaster set around her hands.
See http://www.telegraph.co.uk/news/n...s-accident-during-art-lesson.html

bando1_de

I use drywall plaster instead of plaster of paris. Drywall plaster stays open for a longer time, dissipates less heat, and you can use it to the very little bit because you can always stir it smooth by adding some water. To avoid cracks, I also add a little white glue to the mixture (about 2 spoons glue to half a lb of plaster is enough).

poliss

Sounds much better Erhard. I've always avoided using plaster of paris since my experience with it in 1983. Ruined my mould because I had to get everything done in the minute or so before it hardened.