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Add Surface Curing Agent to resin and MEKP to improve sanding properties in polyester resin. Add to TAP Bond Coat, Structural Lay-Up, Isophthalic and Vinyl Ester resins to achieve a full surface cure. Without surface curing agent (sometimes call "wax") polyester resins will not entirely surface cure even though the surface may not seem tacky. Use about 2 oz per gallon of resin.
for TAP Surface Curing Agent label.
TAP Video: How To Make Fiberglass Part - Part 1
TAP Video: How To Make Fiberglass Part - Part 2