Clay and mache. Aves ClayShay is the best of both. It feels like clay and sets like mache. ClayShay is for universal applications as a clay or a mache. It is a dry powder ready for use with the addition of water and has about a one hour set time. It offers 0% shrinkage. It has a light brown body, is light weight, non-toxic, strong and very versatile.PropertiesFeatures and Benefits : Minimum dust when mixing High Quality Results Multi-purpose Light Brown Color Shelf life of years Easy Clean-up Lightweight Strength Economical 0% Shrinkage ClayShay has a double set to lock in details & eliminate shrinkage. The first soft set occurs about one hour after mixing ClayShay with water. The second, hard set, occurs when moisture dries off in 1 to 4 days.ClayShay can be carved, filed, sanded, painted or other wise finished after set up.>Material Safety Data Sheet (MSDS) available upon request. Documentation Technical Bulletin Comparison Chart Apoxie_FIXIT.pdf Comparison Chart_Mache.pdf