You can apply epoxy saturated fiberglass directly to TotalBoat Polyester Structural Repair Putty only if the putty has been cured using some type of air-dry material, such as PVA (polyvinyl alcohol). Once cured, remove any wax or air-dry material from the surface, abrade by sanding or grinding***, remove residue, and apply the fiberglass that's been wetted out with epoxy.
***NOTE: Air-dried Polyester Structural Repair Putty cures to an extremely hard surface that is difficult to sand.
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