I often use resin parts and also build 1/43 racing cars that are all resin. This is how I handle resin parts:
1. Detach the parts with a micro-saw: X-Acto, Verlinden, etc. For very small parts, I use a Xuron shear to nip them off of the resin base.
2. Clean up the part with a micro-file and sand.
3. Wash the parts with any good dish washing detergent. I use a solution of warm water and Simple Green. You might want to use an old tooth brush here, but go gently on small parts.
4. Prime parts with any good primer. I use petroleum based Floquil primer. This will allow you to see any pin holes in the resin. Just dab a little primer on any imperfections with a fine brush and sand when dry. This is also good to use to prime any metal parts.
5. Normal plastic cement will not work with resin. Use any brand of CA super glue. I also use G-S Hypo Cement on parts that need perfect alignment. It allows plenty of time to position the part properly before setting. (See the March 2003 issue of FSM, page 14, under News&Products).
I'm sure there are many successful variations on the above. This just happens to be the proceedure that I use. Haven't had a disaster yet!
Pete