: . I'm not familiar with the zig-zag japanese rasps,

: Imagine six (I don't remember the exact #) double sided hacksaw blades
: connected together with the 4 middle ones bent in a zig zag fashion. So it
: doesn't have big teeth like a rasp but it has big open spaces for debris
: to clear out. Doesn't grab and is very controllable. Mostly I find carving
: with that tool, curved surform and some sandpaper or dry wall sandpaper is
: all that's needed. I haven't found a way to use a power tool safely or
: with much controll when grinding minicell. Maybe Joe has some advice?

I like to use a wire brush on either a drill or angle grinder to rough out the concave sections of a seat - you are right Lee when you say that it is difficult to control these power tools in foam - they want to grab and "ventilate" the foam excessively. After roughing out the seat, a 24 - 36 grit disc used by hand (not attached to the tool) will help to fine tune seat.

The flat and convex portions of the seat are easily shaped with a surform rasp.

Joe

Redfish Kayaks