Aerocell

Aerocell is a finishing powder consisting of microscopic balloons. These are hollow, white spheres of extremely low density. They give a lightweight filler for use above the waterline, which is easy to sand. Glue powder should also be added to a finishing mixture to prevent sagging in large layer thicknesses and to simplify application. for more info, see: https://www.v-sure.eu/en/products/ancillaries/aerocell-aeroball/