When to fire the second barrel?!

[hennnerz]

I'm having some trouble firing 2nd barrels. I cbet a lot and feel I may be getting floated. If I cbet and then check the turn I will make a note who call-flop then bet-turn. So the people who continuously do this against me I should double barrel from time to time right?

Who else would firing a second barrel against be profitable? Any examples or is it totally read specific? Any stats that can be relied on to help the decision to fire the 2nd or not...?

There doesn't seem to be alot on the subject, so if anyone has a good link then please pass it on.