CONCRETE SUBSTRATES TROUBLESHOOTING PAINT PROBLEMS RELATED TO
CONCRETE SUBSTRATES JUNE 2010
1. FLAKING FROM CONCRETE
Description Paint flaking and delaminating from concrete floor.
Possible diagnosis • Incorrect paint for traffic conditions or contact with chemicals like oil, petrol, detergents etc.
• The incorrect use of an interior epoxy in outdoor UV conditions.
• Poor concrete substrate integrity.
• Moisture ingress due to inadequate moisture barrier under floor.
• Painting before the floor has properly dried.
• Failure to remove surface contaminants such as dust, dirt, oil etc.
Remedy • Pay attention to all of the above. Follow application instructions of NEO Floor Paint or NEO Epoxy Floor Paint.
2. FLAKING FROM PRE-CAST CONCRETE
Paint flaking and delaminating from pre-cast concrete substrates.
Possible diagnosis • Mould release agents are sometimes applied to reduce shattering. These release agents can be oily in nature restricting paint adhesion.
• Failure to remove laitance (powdery weak alkaline layer) which can compromise coating adhesion.
• Dirt, dust and loose deposits on substrate prior to painting.
• Poor quality paint with inferior adhesion properties.
Remedy • Remove release agents by etching, sandblasting or by high pressure power washing.