Onion Mixing Filler Board 100 Sheets. A handy tool for for mixing body filler and other pastes. Clean solution for the mixing of 2-component pastes and materials. Reduces pinholing. Specially formulated paper avoids soaking up resins and solvents. Handy portable solution for mixing body filler, simply tear off and discard used sheet. Please note that this Onion Board may be supplied from U POL, Indasa or Starchem.