If they're leaking and you can't pinpoint exactly where they're leaking from....my advice is to take some packing tape (electrical tape might work too) and tape over the gasket between the glass and the bottom of the window frame. After removing, wire-brushing down to bare metal, wiping with acetone, applying 3M Dynatron550 seam sealer, and reinstalling the windows, and still having leaking.....we found the window frame wasn't the source of the leaks at all. Oh...the interior rainwater catchment system we installed hasn't been necessary either, since we found the source of the leaks. We have yet to permanently reglaze the windows, but we'll do that soon.....the tape is getting brittle and sun damaged.
Much easier to tape a few windows and see if that helps than to remove and reseal the windows only to find out it was a pointless endeavor.
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