I have never tried casting anything in plaster until now, using the large nylon salad bowl my mother gave me 20 years ago as my modelling form.
Playdough walls to define the shape and everything covered liberally with Vaseline. I poured the plaster and allowed it to thicken and spooned out the excess. I made two castings and after finishing them to a smooth polished surface, I glued them together.
As I failed to realise how fragile it was, ordinary Plaster of Paris without an armature, it broke . . .
Now I am starting again but bigger and better. I have acquired a large wok and a bag of terracotta coloured sculpture plaster which not only is very tough but also has iron inclusions which will gradually rust on the surface.
Sally Wakelin - Studies in Creativity 
good luck when casting next time! casting is a difficult proces indeed
Don’t know how I missed all these posts, Sally… but I’m enjoying the “catch up” now!! xo AM
I have made a great many small things in plaster, I love it as a medium, its so quick and the way i work with it, not too messy. I use a lot of multiples, ice cube tray or muffin cases in silicon, then assemble them, just one type or shape at a time, they are serene and sort of unearthly. I must make some more, so many projects on the go.!
We are birds of a feather, Sally. So many projects, so little time!!
yep you’re right there, way too little time! good luck with all your projects too.