Your model will look better if you spend some time cleaning up mold lines with a file or sand paper and filling the inevitable air bubbles. For larger holes, 5-minute epoxy works better than putty, curing in a few minutes and not shrinking as modeling putties do. After it sets up hard, the epoxy can be shaved or filed off level with the surrounding area. For shallower holes, cut the surface of the area to be filled with a hobby knife to give the putty or epoxy something to adhere to, as it does not stick well to shiny resin surfaces. When filing or sanding, please wear some kind of dust mask to prevent the urethane dust from getting inside you. It's not good to eat or breathe.
A two-part epoxy is recommended for assembling these models (Devcon 5-minute epoxy is good), but if you are in a hurry, super-glue can be used. The super-glue bond isn't as strong as an epoxy bond,but will generally work.
WE STRONGLY RECOMMEND THAT YOU SCRUB ANY NEW RESIN MODEL WITH DISHWASHING DETERGENT (DAWN DISHWASHING DETERGENT IS GOOD!) AND A STIFF SCRUB BRUSH. There are always some residual films left behind from the molding process that may inhibit the paint from adhering. When it comes to a choice of primers, we strongly recommend an enamel or lacquer based primer. It will cut through any residual mold release and bond to the resin. We especially recommend Krylon brand Sandable Gray Primer. (In general hobby primers do not have the required solvent strength.)
VERY IMPORTANT: Mist (spray very lightly) a light primer coat and let it dry completely (at least half an hour) before spraying heavier primer coats.
Spray can colors are probably the best for base colors (if you can find one in an appropriate color), after which you can shade or add detail with figure paints.
The polyurethane resin that the models are made of is very tough, but when it does break, it usually does not shatter, but breaks cleanly. If a piece should break, repair the break with a very small amount of thin cyanoacrylate super glue. After the glue dries, simply retouch the paint in the affected area.
Beware of leaving your models in the car on a hot day! These models are plastic after all, and will soften in a car sitting around in the hot sun, just like normal plastic models will. To rebend a warped piece heat, the area to be bent with a hair dryer, gently bend back into place and set the resin by putting it under cold tap water.
Any commercial paint stripper can be used to strip the paint off of a resin model (the resin is much more solvent resistant the styrene plastic).