Talc is the major component of any body filler. #1131 is a sandable filler added for fairing and smoothing the finish of fiberglass laminations. The recommended filler ratio is 2 parts #1131 to 1 part resin to result in a smooth, creamy semi-paste. The exact filler portion will vary by application depending on the desired consistency. Allow to stand one hour before adding hardener and using.