Phaedra,

Grinding down is not really necessary.

Sanding the top down with 240, or 320, will make for a an excellent
bonding surface for the new paint to stick to, and it will level the
Ca-Ca paint down without damaging the fiberglass below.

If there isn't an air compressor available, and a professional DA
sander, then an electric orbital sander will work just fine.

It will make the job one hell of allot faster, and make for a slicker
finished product.

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Terry--
74 Campmobile- (Clementine)
85 GL- (Delilah)
86 BMW 325 ES- (Eva)