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GC is sprayed onto the mold before any of the structural related glasswork is done. The quality of the GC finish is then related to the smoothness of the mold.
The more blimish free the mold is the less hand work there is to produce the beautiful GC finish BW is known for.

With only having experience with GC on a boat I can't attest to anything related to a painted hulls surface. You might want to consider GCing the interior and hull cap and painting the outside of the hull. This method would allow the attendant scratches from foot traffic, dragged coolers, anchors etc. to be repaired with seemless results. A repaired painted surface is much more difficult to repair with seemless results.

Zap