Notes on seam sealing - AH97.10-P-0003-01A
Curing rate for joint seals
Curing rate at 50% relative humidity at coat thickness of (mm).
- A Coat thickness (mm)
- B Time (days)
Product description:
- Single-component polyurethane sealant is hardened to an elastomer by the moisture in the air
Application range:
- This material is suitable for resilient and permanent sealing with good adhesion.
Suitable substrates include metals, metal with primer finish and enamel finishes (2-component systems).
Processing:
- The joint subsurfaces must be clean, dry and free of dust and grease.
- Fillers/primers must be applied before applying the joint seal. Apply joint seal only after filler/primer has dried completely.
- Cut off nozzle tip to match joint width and apply sealant to the joint without entraining air bubbles using piston rod compressed air, battery powered or manual gun.
- The optimum processing temperature is between 15°C and 25°C.
- Paint over joint seal only after it has cured completely. The cross-linking reaction is caused by contact with moisture in the air. At low temperatures the moisture content in the air is low and the cross-linking reaction takes slightly longer (see diagram).
- Longer standing times should be avoided to exclude paint adhesion losses.