The art of preservation is known as as restoration or art conservation. The metal sculpture are easy to preserve as they are made of metal they are hard to break. But the metal sculpture mostly gets attack by Rust. For their preservation there are special type of paints such Rust resistance paint. Or layer of anti rust is coated in the painting. But in the clay sculptures there is not any need of the anti rust coat or paint. They are usually handled with care because they may break if they fall. In stone Sculpture They are usually carved by a single stone. And they may decay so the anti decay colours are used for the preservation of such stones.