Stan, the 2k wasn't that bad to sand. Once you cut through the gloss it is pretty much the same as any other paint. Bit of sanding to end up with a 3 tone finish - red, undercoat and the occasional spot of bare timber and the grain had disappeared. I used some CA glue (essentially super glue) to seal the grain on the patches that I'd rubbed through. A trick I picked up elsewhere. Smooth the CA out with your finger.
The CA absorbs into the grain a little and stops it swelling, fluffing up etc. Another light sand to smooth out the CA spots, quick undercoat and it was ready to patin again.
2 top coats yesterday and I'm happy with the finish now. Just need to let it fully cure during the week and for the 3rd coat of DingoStain to cure on the neck and should be in business for assembly next weekend.