How to Waterproof Plaster of Paris | eHow Brush on dried plasterware several coatings of PU waterproof H20 covercoats and allow to dry thoroughly followed by Urethane clear aerosol spray to gloss protect. For outdoor display not intended to hold water.
Leaf Casting with Plaster of Paris for Gorgeous 3-D Leaves
Here is a rough translation in English. Plaster powdered (plaster of Paris?) Water A receptacle to mix plaster 1 spoon to mix Square moulds of silicone tealight Mat acrylic paint and brush Dull varnish