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Painting Problems and Solutions

What is it?
  • The complete paint system is flaking and lifting from the galvanized substrate. Dark grey flecks are observed to be adhering to the back of the primer.
Possible Causes
  • Poor quality galvanized coating and or when one or two pack acid etch primers have been applied.The primer is adhering or etching onto the topmost layer of the zinc. When subsequent coats (undercoat/topcoat) are applied they produce stresses in the zinc film which delaminates in the process.
How Can I Fix This Problem
  • Galvanised coating with poor integrity is a difficult substrate to overcoat.
  • Follow the recommendations as outlined in part 2.
  • Avoid using an acid etch primer on Galvanized or Zinc coated substrates.
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