$2-$5 NL, effective stack $500. 6-handed. UTG raises to $15. I’m next to act. 9c9d. I 3-bet to $45. I wanted to isolate, but the button. Folds to BB who calls.
FLOP ($137). 9h7c3s. Checked to me. I bet $50. Both players call.
TURN ($287) 5s. I bet $100. I chose this size to keep them in with their bullcrap. BB check-raises all in. UTG calls. I gladly call. River is 8h. Results later.
I think it’s best to play sets fast. I’m interested in bet sizing. Should I have used different sizes on any street?
Thanks.

bet sizing isn't going to be too important here, your stack sizes and the fact that it's multiway means it's going to be easy to get it all in. People also take 100 dollar bets seriously in 2/5. You're left with 300 and a 500 dollar pot on the river.

So sure, like it.

flop bet looks a little light, but rest is fine

Flop looks good, would go bigger on turn. Think the smaller sizing mostly rewards villains both drawing cheaper and when they hey there on river and you have to payoff anyway.

I don't like the 3-bet with 99 in EP. I don't think you'll be successful in buying the button that early very often, unless this is a tighter than normal game.

AP, I am generally against bets under 1/2 pot, but if there was ever a place for it, this is it.

This is an exact quote from another of your posts on a 994 when hero had JJ. Very different spots. What is wrong with you? Also is buying the button the only reason to 3 bet with 99? What is buying the button? Would you 3 bet AA to buy the button?

Buying the button is raising to get the rest of the field who has position on you to fold, expecting that someone who opened in an earlier position will call your raise and you will therefore have position for the rest of the hand.

Buying the button is rarely a good reason to three-bet in LLSNL, but can be a good reason to raise over limpers. I might occasionally 3-bet 99 as a combo of value and hoping to buy the button/isolate if a particularly spewy player had opened and there were other solid players yet to act, but not often.

I would never be trying to buy the button when raising AA. It would all be for fat value, and I'd be happy if someone in later position cold-called to give me even more fat value.

As for your comment about something being "an exact quote from another of your posts on a 994 when hero had JJ," I assume that you're talking about my comment on small bet-sizing. In a 3-bet pot on a dry board when you can still get stacks in with several small bets (so this hand, and likely also the JJ on a 994 board) is the one place where I can make a case for small bets post.

I’m with you. Allow me to explain the dynamics a little better. This game is a rotation between NL and PLO. Sometimes we throw in PLO8 and stud. Most of these players are the typical PLO action junkies who do one of two things when we are on the NL rotation: they either play way too many hands because they’re used to playing every hand in PLO or they fold all of their NL hands except Aa, KK, AK because they don’t know how to play hold em. I was banking on them all folding everything except premiums to my 3-bet. In a normal game I’d call the majority of my range except for obvious value raises.

I'm not sure I understand the logic here. You raised to isolate yourself against the top of their range? Bluffing to get AQ/AJ/KQ and TT to fold?

Did you read what I wrote? They fold way too much. Premiums are basically the only hands they would play.