duplicating a model/piece of a model with resin, or whatever else would work?HELP!

i was originally gonna dupicate a model out of fiberglass using a trick i learned for duplicating car parts in hot rod magizine, but thought you car modeling geniuses might have a different way to do it here. i know there is probally numerous threads about it on here, but the search function is my enemy. i can hardly ever find what i am looking for when i use it. please help me out guys, if you have any websites where i can buy products to make the duplication, or give details on how to do it. thanks again:flash:

micro-mark (http://www.micromark.com/) sells some supplies you would need.

here's some instructions (http://www.asahi-net.or.jp/~xr2h-fkd/scalemodels/project/porsche/rmboxster/rmboxster04.htm) by hirofkd

thanks alot,i can use the mold technique i found in hot rod, with that resin instead of fiberglass. seems easy enough. if anyone else knows where to get resin, or has an other tecniques they would like to share, let me know!