Smallie, once the plastic is semi formed and warm it will likely hold 95 % of the shape of the mold it came from. It's when the thin part of the lure, like the tail on a swimbait that is bent for a few weeks, it will deform to the postion it was twisted in. We use clamshells for all our swimbaits and have recently purchased a custom shell for our 9.5" Shadzilla. When someone pays the price for a hand dipped swimbait, you want a pack it so it runs true....return customers are key