Red Devil 0846DS RD-DS 181 Acrylic Duct Sealant, Gray Go to amazon.com Related posts Top 11 best duct sealant caulk 2022 FeaturePermanently flexiblePaintableStrong adhesive gripNon-flammableExcellent elasticity DescriptionRd-ds 181 acrylic duct sealant is a Gray water-based duct sealant used in medium and high-pressure duct systems. Made in USA