I have used plaster and bondo and resin. I did not like my experiences with any of them. I probably had better results from the oomoo resin than the plaster and bondo. You can make molds out of all of those. I made a few molds that actually made some ok baits. It is just very time consuming and you have to do a lot of trimming and with the small cavities for panfish baits, it just does not work all that great. However this is a matter of opinion and you may do well with it. I myself did not prefer it and only had limited results. Someone here use to make some pretty nice baits out of the bondo and had pictures of them. I do not remember the name right off but you might could look through some old posts. His baits looked pretty darn good.