re: Poker & $200 NLHE Full Ring: LIVE GAME :Flopped nut straight, but board paired on the turn
First, fold or raise on the button. Limping the button is almost always a terrible play.
Second, I don't particularly like overbetting the pot here. A $6 to $8 bet (similar to what you did) is fine. I'm not averse to a smaller overbet, maybe $10 --- but I think $15 could be an action killer.
Third, I agree with the feedback you've already gotten about 3-betting the flop. It's a very draw-heavy flop, so you should be re-popping there.
Finally, I disagree with JillyChemung's assessment of the turn play. This was a limped pot. Villains most likely hand in this spot are 8x or a flush draw --- possibly both. The only combos that have you crushed are 44 (3), 66 (3), 88 (3), 86 (6), 84 (6), and 57hh (1). That's 22 combos. There are 20 other combos of 8x that might play the hand this way, especially 8xhh. Plus there are non-8 FDs, overpair (discounted due to preflop limp), a couple of 55 or 77 combos by stupid players, some 6x (big x) hand from stupid players, and air. I don't have access to an equity calculator at the moment (just like you at the table), but I'm shoving here every time unless I have a live read about the SB being nitty/passive --- and that isn't your read on SB.
Folding here is very weak and if you make this fold, good players will exploit you frequently in similar spots.
P.S. JillyChemung is a solid player. I just happen to think that this particular advice is bad.