Do I have to sand EZ-Fillet before reinforcing with fiberglass?

A structural fillet can be created by fiberglass over EZ-Fillet. No sanding of the fillet is required if System Three epoxies are used, and they are applied within 24 hours of applying the fillet. If more than 24 hours have passed or another manufactures resin is used, sand the fillet with 80-100 grit sandpaper before fiberglassing. 

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