Kyrilian wrote:

Does anyone have good ideas for finding the leak location?  I'm still building.

Before you presume leaks, check the fittings and sealed off openings again. I tried three times before was successful in sealing my IV-P wings, but once I achieved a good seal, they held air for several days, with the balloon inflating and deflating with changes in the atmospheric pressure.

 

One example of a leak that took me a while to identify—and seal—was the filler cap. I had laid two strips of sealing/release tape across the opening, since one strip was not wide enough to cover the opening. Turned out I was loosing air through the tiny gap formed at the edge of the first piece of tape where the second lapped over. Found it with soap bubbles, but the leak was about two-three small bubbles per minute—so slow that I missed it the first couple of tests… Hope this helps.

 

Bob Pastusek