In my experiences at least, resin will stink for a very long time. It took my ODST helmet a month before it wasn't permeating odors, and even now still has a bit of a smell when it's worn. What I find works well is to just seal the stuff. Once you are satisfied with the inside, get a good thick primer paint (I'd imagine waterproof ones would seal better) and hose the inside with it, and let it cure overnight. I did that one my MkV and it just smells faintly of paint, which is a lot better than toxic resins.
I thoughtI did something wrong do are the any other odd things to be expected? And If iharden my weapons can I fill them with rondo or something else?