When the paint lifts from the underlying surface in the form of flakes, it is generally preceded by Cracking and this occurs on different surfaces.
|Excessive Dry Film Thickness. This thickness is prominent with acid catalyzed materials||
• Use wet film gauge during application.
• Ensure not to have a dry film thickness of more than 4-5 mils with acid catalyzed materials or pre-catalyzed lacquers.
|Cracking by Occurrence of Repeated cycles of Freezing and Return to Room temperature.||
• Put a small piece of painted wood in a freezer for an hour and then, keep it in the room temperature.
• Repeat the process for 10 times and check whether the paint cracks.
• Paints are formulated mostly to resist upto 10 cycles.
|Cracking of Grain or Veneer||Cracks following the wood grain show that the wood is actually cracking and not the paint.|
|Cracking of Exterior wood and plywood as it Expands and Contracts depending on the Humidity and Temperature. The change is transmitted along the coating also.||Scrape, sand or scrub with a wire brush to remove loose and peeling paint.|
|Poor Paint Penetration on wood with excessive amount of ‘flat’ hard grain pattern that is smooth, hard and non-porous.||If needed, sand wood to a fresh surface.|
|Poor Surface Preparation / Applying thin coat of paint||
• Do not allow the wood to weather prior to coating.
• Follow label and data page directions on how to prepare surface, before coating.