50NL stupid bluff?

[kmind]

Just sat down. I put him on a flush draw with a call on flop and check on turn even though I really have no reads on him. I would have thought he would be scared of a flush and want to raise if he did have a good hand. My goal is to make him believe I have an overpair. Is this a good time to bluff or is it spewage? If this was my goal, should I have bet hard on the turn too? Just give the hand up?:

POKERSTARS GAME #7650414641: HOLD'EM NO LIMIT ($0.25/$0.50) - 2006/12/28 - 18:26:39 (ET)
Table 'Memnon' 6-max Seat #4 is the button
Seat 1: tman7373 ($124.65 in chips)
Seat 3: Chaosmattes ($51.70 in chips)
Seat 4: Rondavu ($65.15 in chips)
Seat 5: WolfOnlce ($19.60 in chips)
Seat 6: kmind ($49.25 in chips)
WolfOnlce: posts small blind $0.25
kmind: posts big blind $0.50
*** HOLE CARDS ***
Dealt to kmind [Qd Ks]
tman7373: calls $0.50
Chaosmattes: calls $0.50
Rondavu: folds
WolfOnlce: folds
kmind: raises $2.50 to $3
tman7373: folds
Chaosmattes: calls $2.50
*** FLOP *** [3s 5h 8s]
kmind: bets $5
Chaosmattes: calls $5
*** TURN *** [3s 5h 8s] [7c]
kmind: checks
Chaosmattes: checks
*** RIVER *** [3s 5h 8s 7c] [8h]
kmind: bets $10

p.s. just a coincidence that I was playing with rondavu...

[IowaSkinsFan]

The only hands that he's folding are ones your beating anyway most of the time. So yeah he has a weak hand but will probably call.