And treated with a

During installation, gypsum is adjusted to all irregularities and treated with a primer, after which you can paint the elements under gold or marble. Usually gypsum elements are made to order. Now there is a good replacement for gypsum — a light and rather cheap finish of polyurethane foam. It does not crumble, does not suffer from moisture and it can be independently glued to a special putty or polyurethane glue.