Thanks Guys - v. helpful. I have been using a turtle wax T-Cut until now, but it takes a while, okay for the final coat, but I need something a bit grittier first - may try G3.
Re. power tools...what is best? I have been using a Dewalt Round, Orbital Sander with a sheeps wool mop (dry) and it has been OK, but I was thinking maybe somehting run on a compressor would give a greater RPM and therefore make it easier?