I like water putty a lot better than pop, just a personal preference. When I first started making my own molds I tried pop. Had a lot of problems with it, tried water putty and never looked back. You can make just about any type of lure you want successfully, it's all about the venting. I was able to pour Berkeley chigger craws in water putty molds with perfect legs and claws every time. Just do a search for water putty and you'll find lots of info.