21 minutes ago, jedovaty said:
Replying to myself, what if I heat the salt in the oven? This might bring in enough residual heat and melt/stick to the top. Of course, this won't work with other decorations, but for now, this'll work. Or maybe molded bon bons just weren't made for topping decorations?
How about putting it on while the bonbon is still wet. That works for enrobed bonbons.