resin molds

[grygon.livejournal.com]

How many here make their own molds? What are your methods?

I know that Easy Craft(?) makes a ton of resin things, including these make-your-own-molds rubber and putty:
http://www.resinobsession.com/silicone/
but I can never find anything in my local Michael's and Hobby Lobby (frankly, my city's crafting stores SUCK)

The two putties look easiest to use (frankly, I am not sure how you use the other two anyway as they're liquids?). What is your experiences?

I bought some rat mummies and skeletons off eBay a while ago and today they finally arrived in the mail... very much miss-IDed. lol. I have a mouse mummy and these things are half the size of it. I am positive they are young mice. And they are extremely fragile. While they were in transit I had all sorts of shadow-box ideas for them but now the only thing to do is make custom resin molds and seal them for life.