I'll chime in here since I've done some work with resin. Two words - pressure pot. A pressure pot is absolutely required in the process - you stir the resin components (Parts A & B) and you create bubbles. The resin begins curing and these bubbles do not have time to rise to the surface, and are therefore trapped in the hardened resin. Even worse, they get trapped around undercuts and on the facings of your product. This wasted resin costs you money you will not be able to recover (short of increasing prices) and, even worse, it costs you valuable time. I'm sure you have a real job - do you want to spend your free time casting duds? I didn't think so.
You're in the US, so you can buy a cheap paint pressure pot, some fittings, and a compressor, and you're good to go. Again, it's extra up front, but well worth the smooth results you'll get in your final product. The pressure squeezes the bubbles down to a point where they are no longer a concern. In addition, it will help push the liquid resin into tight spots that you might not be able to fill otherwise. The pressure pot is an invaluable resource to a resin caster.
And this doesn't cover molds, degassing your molds, vacuum pumps, etc.
Personally, resin casting is extremely easy - I don't know what resin these other guys have used, but the stuff I get is pretty much odor free and can be eyeballed for measuring. The molds are the pain in the butt, and even they really aren't that hard, just time consuming and a bit messy.
Of course, all of this is a moot point if you outsource.
