Silicone only cures to silicone. Since most hardware silicone isn't safe for prolonged contact with skin (and it can saturate through the bra and make contact that way) I would get silpoxy or a small thing of premium silicone to attach them.
(This is the reason I sell my shells and starfish pairs with a felt backing on them. Makes things easier on the customers)


Sent from my iPhone using Tapatalk