I second that - I use a foam sanding block but ONLY for the last phases of wetsanding.
For shaping, fairing, and filling, I use a home-made long board that has served me very well.

[Linked Image]

The hull on the right had not yet been polished.
[Linked Image]

I made a smaller version of the long board for this project:
[Linked Image]

[Linked Image]


Jake Kohl