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I may be off base here, but I believe that the very tiny leaks that we are trying to stop on CRTs are much too small for a liquid like vacseal to be "sucked into". I look at it as a dense low-vapor pressure coating that essentially provides a second containment wall, in case the first fails. I have painted it around CRT neck pins, base pins and tip seals as a preventive measure. I have no statistically significant proof that it did any good, but in those small quantities, it is pretty cheap per application.
jr
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