Resin??

James, I can only go from what I do, but in answer to your questions:

1. I use either a razor saw, or a small razor saw blade, about an inch long, in a scalpel handle.
2.Use superglue, or possibly epoxy.
3.I usually just wash them thoroughly in detergent and then paint, but I know several manufacturers, Gunze for sure, produce a dedicated resin primer.

Hope this helps.

Karl

Just a word of warning though, when you saw or sand resin bits: wear a mask as fine resin dust does not do anything nice to your lungs...

Thanks Karl for the tips and thanks for the heads up djmodels1999, been an asthmatic I have to be careful what I breathe in.

James