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Shop vac is a great way to put on the vacuum to seal the leak when you know
where it comes out on the surface.  Also the Jefco 9700 sealer works well
for this purpose.  Mix up a tablespoon or two and squeegee it over the
leaking surface.  Turn on the vacuum for about 30 seconds.  Turn off vacuum.
Wipe away excess.  Wait a few hours.  Retest for leaks.

I had four leaks - they all went away after one application of above
process.

Regards,
John Barrett

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