: I have found that a cupped wire brush on a drill motor works great for the
: fast bulk removal before using dragon skin or the drywall sanding mesh for
: final shaping. More than one way to skin a cat or carve a seat.

I use a chain saw disk on my 4" angle grinder. Nice and fast but hold
those elbows tight against your sides. Then I shape with a 2" circle
of 36 grit, then go to 80 grit for nice suede finish.

Oh, to keep the minicell dust and bits from covering everthing in my
shop I make a small booth by clamping some 1 x 2s to the rafters
and wrap in plastic sheet. Sure makes clean up easier.

All the best,
Rob