[NL100 SH] 22 - From Float to bluff

[Kreatief]

Hi,

PartyPoker $100 NL Hold'em <font color="#0000FF">(6 handed)</font> HandRecorder v0.9b

Stacks &amp; Stats
CO ($99.50)
SB ($28.55)
BB ($118.01)
UTG ($160.58)
MP ($130.25) (20/17/4.66/21) (2776h)
Hero ($107)

Preflop: Hero is BU with 2[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/club.gif[/img]
<font color="#666666">1 folds</font>, <font color="#FF0000">MP raises to $4</font>, <font color="#666666">1 folds</font>, Hero calls $4, <font color="#666666">2 folds</font>.

Flop: ($9.50) K[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#FF0000">MP bets $6.50</font>, Hero calls $6.50.

Turn: ($22.50) 5[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#FF0000">MP bets $16</font>, <font color="#FF0000">Hero raises to $40</font>, MP folds.

Final Pot: $78.50.

Villain seemed to be able to fold. I planned to float him. His bet seemed kinda weak. Is it ok to bluff here?