Find anything wrong with this overbet and donkey punch? (OOP)

[Card08]

Party Poker No-Limit Hold'em, $0.25 BB (6 max, 4 handed) converter

Hero ($11.4)
UTG ($19)
Button ($16.3)
SB ($91.14)

Preflop: Hero is BB with 9[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/spade.gif[/img].
UTG calls $0.25, Button calls $0.25, SB completes, Hero checks.

Flop: ($1) 9[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets $0.4</font>, UTG calls $0.40, Button calls $0.40, SB folds.

Turn: ($2.20) T[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets $7</font>, UTG folds, Button calls $7.

River: ($16.20) 9[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $3.75 (All-In)</font>, Button calls $3.75.

Final Pot: $23.70


Felt weak on the flop so I decided to overbet into the turn as button had been playing really loose and likely had an Ace in this spot. River is no-brainer but is this kind of overbet a weapon you can use consistently with success at this level? I'm trying to devise a better way of playing these kind of rag 2pr out of position hands, switching between hard/soft line and fast/slowplay (veering away from slowplay as of right now with OOP hands).