Interesting situation.Flopped set in 4way pot.

[BigBadBull]

I don't know about this one. Raise more flop?3 people with me on flop, so I'd think a raise would get called, however most fold, even though the raise is so awful.Maybe that flop bet gave my set away?
Or check flop and bet turn? But the spades scare me and I don't want to give a free card...
I'm lost on turn. I'd hope AK or better, maybe A5 called flop and would pay more. 8$ pot, how much do you bet? 6.25 was obv too much, but will flush draws call half pot($4)? If so, we don't want to give free cards.

PokerStars No-Limit Hold'em, $0.25 BB (9 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver Cards)

MP1 ($24.25)
MP2 ($14)
MP3 ($10)
CO ($5.20)
Button ($41.20)
SB ($10.25)
Hero ($28.55)
UTG ($15.85)
UTG+1 ($13.40)

Preflop: Hero is BB with , .
UTG calls $0.25, 4 folds, CO raises to $1, Button calls $1, 1 fold, Hero calls $0.75, UTG calls $0.75.

Flop: ($4.10) , , (4 players)
Hero checks, UTG checks, CO checks, Button bets $0.25, Hero raises to $1.5, UTG calls $1.50, CO folds, Button calls $1.25.

Turn: ($8.60) (3 players)
Hero bets $6.25, UTG folds, Button folds.

Final Pot: $8.60

Results in white below:
No showdown. Hero wins $8.60.

[BankItDrew]

your flop bet might be a 6 times raise amount than the initial bet, but you're still betting 1/3 pot. Pot it.

[Jimmy Mac]

Check raise the flop to at least $4, or just lead out for $3-4 yourself. Turn bet is fine.

You just have to accept that you aren't going to stack someone everytime you hit a set. Just choose a line that maximizes your value if they do have a hand. Here you should be sizing your bets so you can get AI by the river, and also obv enough to charge a possible flsh draw.

[wufwugy]

Donk the flop, it's the easiest way to get money in without looking super strong. Any ace or fd will call down.

[daven]

But the spades scare me and I don't want to give a free card...

your flop raise doesn't solve this, any flush draw SHOULD call this, given the pot odds you have offered. Raise to close to pot, $4.