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Gary H 1978 911 SC
Join Date: Oct 2003
Location: Fort Worth Texas
Posts: 1,306
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My house was built in 1954 and I have inspected my ducts with a white glove test and I only got a light smear or nothing at all. If your ducts are leaking 20-30 % sealing them with a film of spray coating will have little of no effect. 30% is a massive leak and that issue can not be fixed with taking the ducts apart and resealing and applying a mastic over-coating.
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Gary H 1978 911 SC
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