Soak and wash all parts in soapy dish water first to make sure all release or surface build up that is on the resin is gone... Rinse well...
Get yourself some Bondo, Squadron Putty, Milliput or whatever kind of filler putty you can find to fill in any gaps or imperfections...
CA glue as SLK said is probably going to be your best bet unless you want to use a 2 part epoxy...
After it's built my advice is a water based (like Krylon H20) primer, prime wet sand until smooth and then top coat... The reason I like water based primers is that they are less likely to react with different top coats...