I've been thinking of using GE silicone I over painted neoprene for my first tail, too. Are you painting first then putting a straight coat of silicone over it? Do you plan to do anything dimensional with the silicone? I tried my first tests today with a mesh (trying to emulate the Alex latex technique) and it was an utter fail. I think I let it cure for too long (10 minutes is too long!?) Anyway, yours is looking fabulous! Looking forward to seeing the final product!