I like to bet these situations hard. I'm rarely getting paid off, but when I do, I stack some poor idiot who decided I was bluffing.

Pot the flop, Pot the turn, Pot the river. Potting flop and turn can convince a K[img]/images/graemlins/club.gif[/img] (or even J[img]/images/graemlins/club.gif[/img]) that you don't have it.