8 litres was more than enough to paint my 13 ft
Boler with a roller. I have enough left over for future touchups. I am not sure if spraying will use more or less.
There are gelcoat products available to restore the original finish
http://ca.binnacle.com/product_info....oducts_id=5238
but, if you are
painting then sand. sand.sand, fill in holes, chips etc with Bondo and then sand,sand, sand! Use a good quality sandable primer and then sand, sand, sand!
Finally paint, sand lightly, and apply second coat etc.