If you have a Hobby Lobby close-by, start there. Look for the model-kits aisle then side-step one or two aisles (varies by store) and look for the tall metal rack of Alumilite products. This is frequently adjacent to the tools pegs where they keep the X-acto/Excel hobby knives and the like. You can get everything you need right here. Personally, I use the Alumilite resin that is found several more aisles over, with the soap & candle molding products, but Clint uses the resin back over where you started and we both get good results. (I'm seeing the inside of the closest HL store as I write this)
There are two mold-making silicones on the rack in very similar boxes - Quick-Set and High Strength III. For our purposes, heads and helmets - lots of detail and significant undercuts, we use the HSIII. I think I may have some applications coming up where the Quick-Set will work fine, but that's a ways out just yet. The "quick-start kits" have Quick-Set in them, so I recommend NOT getting one of them. Get a box of HSIII and a box of the resin - both come with a couple of mixing cups and stirring sticks. You should also pick up some disposable plastic cups, like 5oz Dixie cups. If you want, I can post a quick vid showing how I don't even use the measuring cup on the HSIII when I pour up a new mold. (hint - the 5oz Dixie cup has ridges and one of them matches up exactly to 2oz of HSIII - fill to that ridge then mix in the B-part/catalyst)
I *think* we are making the trek down to the nearest HL tomorrow for some other reasons, so if you'd like, I could take a pic of the aisles & the Alumilite rack so you have something to go by. If you don;t have a Hobby Lobby, I think Michael's Arts & Crafts carries the same material, as well - really any A&C store should. If not, hit up alumilite.com and you'll see a huge selection of stuff. Mind-boggling, really.
It's a lot of fun - but it gets bloody expensive...
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