I just want to say that understanding the logic in nutsinho's post and applying it constantly was probably my biggest step forward in learning to play postflop.

Well like I said i dont think its really a good spot. But I think he will often snap call $16 with his underpairs here since we dont look strong at all (and he doesnt) and we have been stealing a lot already
We don't look like we have a nutted hand but we do look like we have a weak ace, which is stronger than 2nd pair, so I don't see why he would call. I'm sure he won't fold an ace but the point of this bluff is that he doesn't have one very often. It's a big mistake to only bluff when you can represent the nuts. Bluffs representing a thin value bet are often times more effective and should be attempted more often IMO.