I really want to get into using these nicely made Mouth cups , which comes with the casted lips and a whole bit,, all painted up and ready to go,, it seems like being a true time saver,, Have you folks tried them, Do you like them ? what are the pros and cons ? specially on bear rugs. Never using them yet but already that crazy glueing the skin to the lips or even nose sounds abit challenge ... does that glue last long ? I m thinking what if the glue start to lose itself in 5 yrs,, ? Any comments is appreciated .