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Painting Problems and Solutions
What is it?
- Loss of adhesion of a solvent or water based topcoat from a calcium plumbate primer. The problem comes in two forms: a. The topcoat peels off after a few months after the coating have been exposed to hail or severe rain. b. As “a” but the de-lamination of the topcoat occurs almost immediately.
Possible Causes
- For (a); The Calcium plumbate primer was left for more than 48 hours prior to over coating. The calcium plumbate primer has cured too hard and the topcoat has not been able to bond adequately to the primer.
- For (b); A mixture of (a) and possibly a contamination of dirt and oil on the primer prior to applying the topcoat. Water based topcoats are more susceptible.
How Can I Fix This Problem
- Remove the loose and flaking coating. Clean, degrease, wash of cleaner, then lightly abrade and reapply topcoat.
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