If you are trying to use a bait to do a plaster mold . Glue the bait to a plate of some sort with pvc glue . Clean the bait first soap and water will do . Now you will need a tray that accepts the plate dimension . Here is where most people go wrong . Line the tray with cling wrap . Put in the plate bait side up . Pour the plaster in . When you are sure it is set hard remove the plaster pull off the plate . You should have a near perfect replica mold. I just did a 5 '' reaper mold this A.M. . Tonight I will heat it in the oven and spray it with powder paint Then Bake it out . If possible I will post a pic soon .