Microspheres 413 is an equal substitute to QCells. Used as a gap filler, thickener agent for polyester and epoxy resin or strengthens (re-enforces) fin plug installation. Usage Guidelines: Required resin amount and MEKP Hardener or Sunbake Solar Resin Additive; Add Microspheres to resin in small amounts until desired consistency is reached (for best results, a medium paste is recommended “a mayonnaise consistency”; Avoid adding too much Microspheres to the resin or it will be too thick to apply; Stir resin until; Microspheres is completely saturated; Apply mixture to ding repair of fin plugs.