Composite Materials Turboguy, question..

Composite Materials, good, mold, suggestions, long, rubber, hold, shape, stuff, basically, force, substance, type, molds, dispose, pour, question, liquid, foam, form, affordable, guess, turboguy, digging, cheap

Know of any good liquid foam? I need something to pour into molds, something that I can dispose of after I form over it (like digging it out of the mold) So obviously it has to be affordable. I guess any cheap substance would be good, as long as I can rip it out. I know I saw some new rubber type stuff that you can basically force out of a mold and it will hold its shape... Any suggestions?