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Good high quality white silicone is what I use and my company. Duct seal is like heavier plumbers putty and will dry out, shrink, crack and fall out in a year or two. plumbers putty is meant for putting under sinks B4 you set them down and keeps water from going underneath. not meant for anything else. Duct seal is silly putty that kids used to have and a bit heavier.

Silicone, plain and simple.:yes:
 
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