of keep using the board.

Can anybody suggest a cause for this?

http://www.youtube.com/watch?v=IG3q1cy730o

There is a warranty claim in progress, but my immediate question
is whether to cut my season short of keep using the board.
--
PeteCresswell

looks like there is air trapped under the EVA pad, i.e. perfectly
harmless except for a certain nuisance value. To make sure its not
coming from the guts, pressurize board via the vent fixture, apply
soap to suspect area and watch for bubbles.
best of luck!

Per exkraut:

looks like there is air trapped under the EVA pad, i.e. perfectly
harmless except for a certain nuisance value. To make sure its not
coming from the guts, pressurize board via the vent fixture, apply
soap to suspect area and watch for bubbles.
best of luck!

No good deed goes unpunished!

How about applying your expert judgment to this second clip of
the same board - albeit on a different day:http://www.youtube.com/watch?v=uzJkKMdpqEE

Two things are bothering me about the EVA pad explanation - as
attractive as it is to me:

1) Thumb pressure on the EVA pad very close to the leak
   has little effect, while pressure on the stringer area
   on the opposite side from the EVA pad has a pronounced
   effect.

2) The volume and duration of the hissing noise that accompanies
   the leaking when the board is hot (i.e. having been carried
   upside down on the roof racks on a sunny day) does not seem
   tb consistent with the amount of air that could be trapped
   between the EVA pad and the deck - but does seem consist ant
   with the entire board's insides "breathing out".

Now that I'm thinking about, I guess the next test - short of
pressurizing the board, which the dealer counsels against bc it
might create complications with the warranty claim - would be to
catch it hissing on another sunny day; open up the vent plug
100%; and see if the hissing stops.  

If it stops, that would suggest the board is actually leaking
from inside and not under the EVA.

If it keeps hissing, that would suggest that it is, indeed, air
trapped between the EVA pad and the deck.

But this is 100% supposition on my part: I know *nothing* about
this stuff.

What do you think?
--
PeteCresswell

Per exkraut:

that's an easy one, Pete: the center strip is dark, i.e. has a much
higher chance of the contact cement letting go since it absorbs the
sun's warmth much faster than the white padding elsewhere. Still
betcha the water is between the padding and the structural deck.
Btw: by "pressurizing" I mean with something like 1/4inHg via your
lungs. For myself, I use a little bilge pump with bits of plastic hose
slip-jointed, all of which pops apart at about 1/4"Hg, which cannot
possibly harm your board in any way!
Also, if the vent plug is a ways away from the carry handle, there
will be a bit of pressure there on a warm day even is the vent plug is
removed, since the EPS resists enough to prevent instant equalization.
Go blow in there already!

I did a pressure test thusly:
----------------------------------------
- Kept the board in the garage overnight,
  vent plug loose.

- Tightened the vent plug the next day and put the
  board in the sun.

- Knelt down and watched the problem area.

- Observed bubbles/air coming out

- Loosened the vent plug.

- Observed bubbles/air stopped within
  the minute.
----------------------------------------

The distributor has sent a new board already.

I'm going to feel really guilty if it's not a
legitimate leak.  

Ok, maybe not *really* guilty because at first
they weren't going to replace it and my dealer
had to go to bat for me...

But still least *somewhat* guilty.... -)
--
PeteCresswell

that's an easy one, Pete: the center strip is dark, i.e. has a much
higher chance of the contact cement letting go since it absorbs the
sun's warmth much faster than the white padding elsewhere. Still
betcha the water is between the padding and the structural deck.
Btw: by "pressurizing" I mean with something like 1/4inHg via your
lungs. For myself, I use a little bilge pump with bits of plastic hose
slip-jointed, all of which pops apart at about 1/4"Hg, which cannot
possibly harm your board in any way!
Also, if the vent plug is a ways away from the carry handle, there
will be a bit of pressure there on a warm day even is the vent plug is
removed, since the EPS resists enough to prevent instant equalization.
Go blow in there already!