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💨 Seal your airflow like a pro — don’t let leaks hold you back!
DUCT-SEAL 321 by Hardcast is a 10.75-pound, water-based acrylic sealant designed for HVAC professionals. It offers superior adhesion and water resistance across metal, glass fiber, and flexible duct surfaces, ensuring durable, leak-proof seals. With a 4.7-star rating and trusted industry use, it’s the go-to solution for efficient, long-lasting duct sealing.
| ASIN | B071ZQXDQZ |
| Best Sellers Rank | #266,846 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1,197 in Duct Tape |
| Brand | Hardcast |
| Brand Name | Hardcast |
| Compatible Material | Glass,industrial,metal |
| Customer Reviews | 4.7 out of 5 stars 16 Reviews |
| Item Form | Liquid |
| Item Weight | 10.75 Pounds |
| Material | Acrylic |
| Material Type | Acrylic |
| Number of Items | 1 |
| Part Number | DS-321-4 |
| Style | Industrial |
| Style Name | Industrial |
| Surface Recommendation | Metal, Glass Fiber, Flex Duct, Duct Fabric, Flexible Tubing |
| UPC | 638532800500 |
| Unit Count | 1.00 Count |
| Water Resistance Level | Water Resistant |
G**T
Good product
Covers and sticks well
R**.
Durability
I have used this product for many years in the hvac industry.. I have no complaints..
K**E
The best
Totally satisfied, great product
C**Y
Is the real deal
Works amazing!
Trustpilot
1 month ago
2 days ago