Raising with air - ISF theorem?

[Juked07]

Villain was 37/8 fish over 51 hands, with 40% fold to cbet. I felt his range couldn't have anything strong in it and I could have all sorts of nut hands. Is my raise okay? Btw, the 5x open was a misclick.

PokerStars No-Limit Hold'em, $0.50 BB (6 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

Hero (CO) ($60.85)
Button ($50)
SB ($58.45)
BB ($30.35)
UTG ($78.65)
MP ($54.35)

Preflop: Hero is CO with J, 10
UTG calls $0.50, 1 fold, Hero bets $2.50, 3 folds, UTG calls $2

Flop: ($5.75) 5, 8, A (2 players)
UTG checks, Hero bets $4, UTG calls $4

Turn: ($13.75) 5 (2 players)
UTG bets $6.50, Hero raises to $20...

Total pot: $26.75 | Rake: $1.30

[Sup3rM4N]

You need reads to pull off something like this. FWIW, a play like this should not be an often occurrence. If all you have on villain is the stats and that his a fish, I would not recommend this line. Fishes are not thinking enough about your hand/range for a play like this to be profitable.

[ZwiFT]

Considering his range is made of Ax, 8x, and the occational 5x you should be doing this for value and not as a bluff this is quite horrible

[XTR1000]

The 40 vpip limp-calling fish guy is actually more likely to hold 5x than we are (unless you were isolating him very very wide and would be cbetting any piece on flop.) All the boats are in his range (cept maybe AA), so are 76 and FDs which he likely isn´t folding. he is inducing most of the time, trying to block some time and stone cold bluffing almost never. Also, he must have been planning a very ambitious oop float when he peeled the flop with anything he couldnt just c/c again, something i wouldnt give him credit for.

[Mr. Diamond]

I would simply fold turn - this play seems really spewy

[Juked07]

If a player sees a lot of flops and doesn't fold to cbets, doesn't he take a pretty weak range to the turn in general? I was thinking he had as much air as he had made hands, a lot of hands that couldn't call a raise. Fwiw he was also craising flops a lot, so the c/c didn't look nutty at all. In fact he was doing it with half of his hands..

I guess a lot of my play is boringly standard and I am looking to find more spots to make plays. I guess this isn't a good spot I'll keep thinking about it.

[IowaSkinsFan]

I dont see why he cant have a 5, he's a rando fish.

[Renton]

Its bad but you have to imagine that if raising is somehow good that a small amount would be easily better than this. I mean... you shouldn't be planning on him folding any decent hand, so if he is c/c leading some garbage he'll fold as fast to a minraise as he will to 20.

The flop bet is too large too. You really need to unbalance your sizing vs a 40% fold to cbet donk, betting 1/3-1/2 the pot whenever you miss and 3/4 to full pot when you hit.