The order you are doing it in is fine. There is nothing wrong with it. After you have installed the coaming in the regular way, just glass it in place. Cut some bias (diagonal) strips of fiberglass about 10 cm wide. And have about 3 to 4 cm overlap onto the deck with the rest going up onto the coaming.

Yes the deck should be sanded before applying this fiberglass.

> When glassing the deck, I glassed both sides of the deck before cutting
> out the hole for the cockpit. Yes I know this wrong but how should i now
> glass the coaming to get the best result? will this approach weaken the
> coaming in some way? I think I'll be making flush hatches as those in
> Nicks book. What has to be done to the edges of the hatches is it just to
> sand them and put some epoxy on or should there be glass there to? What is
> the best location for the hatches as those descibed in the book? What type
> of gasket is best to use to these hatches? Thanks Mikael