Curing and Finishup:

Let the mixture cure.

It should take, depending on your weather, about 1 hour or so to dry completely.

Don't remove the transparency until dry.

Once dry, remove the transparency and use a fine sand paper to even out any new bumps from the new fiberglass surface.

Then, voila! your board should be back to working order. Get out there and this time try to be more careful on the trip back to the car. ;)