I only used one cup of alginate (I only planned to do the forearm alone) but managed to spread it down to his hand also.
My question is, how do you generally do 'outstretched' hands/arms, where the hand isn't touching the body, would you cast the hand seperate in a container (like baby casting) so that the hand is solid when cast?
My actual cast here is really thin (approx 5-6mm) as I was only experimenting (this was before I got your book and had watched your videos)
When my son get home from school, I'm going to try convince him to let me cast his torso again - the first attempt was a disaster!