Talc

Talc is the major component of any body filler. It is a sandable filler added to smooth the finish of fiberglass (and other resin) laminations. The recommended filler ratio is 2 parts talc to 1 part resin. This will create a smooth, creamy paste that can easily be applied. The exact filler portion will vary by application depending on the desired consistency.

Hydrous Magnesium Silicate