I have tried paper mache atleast a million times and it never gets rock hard it gets tough but not solid still a little bit flimsy you know. What am i doing wrong? Im sure 5-7 layers is enough and i use a 50/50 mix white glue and water. Am i missing something? I always get angry with it when its still flimsy and wind up dropping the elbow on it and drop kicking it into the trash. Any ideas?