Clean and Dry the Surface Before Sealant
Sealing, Leakage, Mastic & Pressure TestingFIELD CHECKField judgment
Core Answer
Remove oil, dust, moisture, loose coating, and metal chips so the approved sealant bonds to the actual surface.
What to Check First
- Check temperature and moisture conditions
- Wipe factory oil and dirt with an approved method
- Remove loose rust or coating without damaging the substrate
- Dry the joint fully
- Apply within the product’s allowed conditions
Ask Foreman
This metal is [oily/wet/coated]. What surface prep and cleaner does the approved sealant require before I apply it?
Do Not Do This
Do not smear mastic over condensation, dust, cutting oil, or loose coating and expect thickness to make up for poor adhesion.
Why This Matters
Sealant that never bonded may look finished while failing during test or after temperature cycling.
Verify against: sealant manufacturer data, project specification, foreman direction.