1905Gerrish
Loves Old Maine canoes
Dave,
Seems you now realize how much work this is. This is the exact reason a quality fill job could save you time. This step is generally not needed much. I'd say a hour of sanding is all I do after the filler has dried. Next time you fill. Go back a day later and rub smooth again and fill more if required. Possibly let it dry another day and go back again to rub smooth and fill more if required. I wish someone would have gave me this advice years ago but I learned the hard way like you are experiencing. Also, all fillers are not the same. I use a 60's OT recipe and add mildew treatment.
Zack
Seems you now realize how much work this is. This is the exact reason a quality fill job could save you time. This step is generally not needed much. I'd say a hour of sanding is all I do after the filler has dried. Next time you fill. Go back a day later and rub smooth again and fill more if required. Possibly let it dry another day and go back again to rub smooth and fill more if required. I wish someone would have gave me this advice years ago but I learned the hard way like you are experiencing. Also, all fillers are not the same. I use a 60's OT recipe and add mildew treatment.
Zack