What do I do if the joint is dusty, oily, or wet before sealing?

Clean and dry the surface before sealing. Sealant, tape, and mastic fail when they are applied over oil, dust, shavings, or moisture.

Make the joint mechanically right before sealing or covering it. Sealant is not a substitute for a loose or dirty joint.

Rectangular Duct & Fittings 2nd Year YELLOW

Stop if

Ask when the contamination is heavy, chemical, wet from condensation/leak, or the approved cleaner is unknown.

Watch out

Do not seal over gaps, dirt, oil, water, or a loose joint.

Check

Confirm the joint is tight
Clean dirt/oil/water from the seal area
Use the approved seal method

Steps

Remove loose dirt and shavings.
Wipe oil/contamination with approved method.
Dry wet areas if required.
Check mechanical fit-up before sealant.
Seal only with approved material.

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In Rectangular Duct Assembly: S-and-Drive, I'm looking at: What do I do if the joint is dusty, oily, or wet before sealing? What should I verify before I cut, drill, seal, cover, move, or install?