invert boat when sun is high, late autumn and summer so hulls will heat during day. This allows fast turnaround and concentrated work ethic.
Mask keels.
Take hose and fill hulls with some water and take this chance to find all topside leaks and mark them. Check for hull seperations.
Mix half fairing powder and half glue to make building putty and stop adding powder as soon as mix sits up and stays. As has been said trim at green time with sharp knife. Sand back and perhaps repeat.
now for several days in a row mix small amount of just resin and paint on in morning and on return from work in evening. This is a ten minute commitment for each time. Measured mixing cups available for nix at chemist. Sand each time with lighter grits each day.
Lasts for a looonnnnggggg time and ensures leak free boats.
Having said this the boats you pick should be BASICLY SOUND. Fagged out sections of flatside or structural areas should be avoided.