I've used gelcoat on the inside of the roof and the inside of the vertical bulkhead behind the seats of my Dino. I just smoothed it on with the same spreader I used for filler, if you put enough on to just cover the surface it won't sag.
When it got to the stage of still being tacky I covered it with clingfilm to exclude the air and speed up the drying time as gelcoat drying is air inhibited (which is why they put wax in gelcoat to make flowcoat, the wax floats to the surface and forms a barrier to air)
I tried using flowcoat but was not happy with the finish, it has a dull sheen unlike the shine you get with gelcoat. I suppose I could remove the wax with solvent but it seems like unnecessary extra work to me.
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