Mastic can be brushed on flexible duct124. Mastic is a versatile air duct sealant that can be applied using various methods, including brushing, to seal joints and seams in flexible air ducts24. When applying mastic to flexible duct:
- Ensure the surface is clean and dry before application7.
- Use a brush to apply the mastic directly on the duct, not on the insulation or sleeve7.
- For gaps larger than 1/4 inch, use fiberglass mesh tape in combination with mastic for a more secure seal7.
- Allow the mastic to dry completely after application5.
Mastic sealant is preferred over duct tape for sealing flexible ducts because it creates a more durable, flexible, and long-lasting seal that can withstand temperature changes and vibrations4. When applied correctly, mastic sealant can last up to 20 years or longer, significantly improving HVAC system efficiency and reducing maintenance requirements4.
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