[TCML] Preparing acrylic coil form

[Mark Lock]

Hi all.
I've been slowly building my first TC for a while now and I've recently
acquired my coil form, a nice piece of acrylic. My question is what do I
need to do to prepare it for winding? I've read that it should be cleaned
with a solvent, sanded, dried and varnished among others, but is that all
necessary?
My transformer is 12KV 30mA if that's any indication of how much insulation
is required.

Thanks for your help, this mailing is awesome.
Matthew.