Modroc is Plaster of Paris impregnated gauze which is easy to use and shape, and is great for making sculptures
It's basically the same stuff as they use when they put a cast on a broken bone. It sets quickly, and dries hard. The kids have used it in the past to make sculptures by wrapping it around wire, this time they decided to make bowls.
The kids used balloons to get their shape. They simply cut strips of the modroc, dipped it into water, and then smoothed it over their balloons to make the bowl shape. The modroc clings well to the balloon, as long as you only build up one layer at a time, and let each layer dry before adding the next. The layers only take 30 mins or so to dry before it is firm enough to add the next. The kids chose to do two layers for their bowls, with the bigger bowl using up the whole packet, while the smaller one had about a third left over (they were using 6cm x 2m rolls to give you an idea of how far it goes). My daughter added a foot to her bowl, as we thought that it may be a little unstable due to its shape.
Once the bowls were dry, the lifted easily off the balloons. The kids then painted them with gold and silver inside, then added a glitter layer. It was then useful to place them back on the balloons to paint the outside. The dried modroc is easy to cut with scissors, if you decide you want to trim your creation in any way. Once the bowls were completed the kids filled them with Christmas Pot Pourri made out of pine cones, bark, cinnamon sticks, seed heads, star anise and dried orange slices. Please check out our Drying Orange Slices and Peel tutorial to see how it easy this is to do!