I have redesigned many of my molds for the certain reason that not enough error was escaping we do not recommend anybody to redesign their molds you may destroy what you have but sometimes we do use a very small chisel and cut grooves so the air could escape it usually solves all my problems especially when we were making 2 color baits tail color one in the body a second color what happens sometimes just the mold makers will make the so one-shot deal they are not considering making a 2 color bait you have to make sure that the body gets enough air to escape so if you before you order a mold and you are wanting to make two color baits make sure that you check out the mold before you buy one just make sure that it is properly made so the air could escape in the cavities in the body and also in the tail. also when you are shooting your molds make sure that when you feel the injector that you personal little bit of the plastic backed out before you shoot the mold this way if there is any error in the end of your injector you are pushing it out before you shoot your mold number one mistake with many of the beginners.