how can i make a gypsum cast extremal hard and weather resistant?

Question

i like to make gypsum casting of statues but i like to make them very hard and weather resistant,even if the original white colour is changed ,any idea how?? thankyou,,,

Answer 1

Plaster will not last in the rain. Painting it with something is your best option. Cement or mortor WILL last in the rain.

Answer 2

The same technology that allows a boat to float can keep your sculpture waterproofed...fiberglass and resin. We too are exploring this medium, and so far as we can tell, you need to understand the process...best...