: Robert, I had the same problem, with gaps opening the more I
: sanded. I used the sanding dust from the boat and mixed it with
: clear wood glue , using it to fill the gaps. As the filler dried
: in the gaps I pressed in fresh sanding dust on top of it. It
: dried very close to the hull colour and the gaps were barely
: noticable after it dried and was sanded.

If the gaps get wider as you sand, it is almost certainly because you are over beveling your strips.
Take off less and try the fit more often and you should overcome the problem.
This advice is no good for the build you are on but will improve the fit and hence the looks of the next one.
"More haste -less speed!!!" There's bound to be a next one.

Les C.