STRUCTO-LITE® BRAND Basecoat is a mill-mixed perlite-aggregate gypsum plaster. It requires only the addition of water at the jobsite. STRUCTO-LITE Basecoat is USG’s lightest-weight and most highly insulated plaster. What is gypsum plaster? gypsum plaster, white cementing material made by partial or complete dehydration of the mineral gypsum, commonly withRead More →