My coot mold is at end of life. I just finished a run of 3 dozen and it is starting to break up. I have the plug and can make a new mold easy enough. This mold was made with Smooth-on Rebound 25. I think I got around 8 dozen out of this mold, maybe less, I lost count! Any materials I should try that is cheaper or may last longer? I did not use a mother mold, just the Rebound.