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July 24 - July 28, 2017

How many times can a building be repainted before the paint becomes too thick to perform properly?

Selected Answers

From Zenith Czora of Parex Davco on July 30, 2017:
It is dependent on the integrity of the existing coatings and not compromising the permeability or breathability of the existing coatings. Adhesion and permeance of the coatings should be checked first. The thicker the film, the more it retards or prevents moisture from escaping. The new paint to be applied  should have at least have the same permeability rating or even slightly higher to allow moisture to escape but does not allow bulk water to penetrate in. The existing coating should be able to provide a good inter-coat adhesion to the new coating being applied. Test patch is always recommended.

From Paul Gardner of Paul N. Gardner Company, Inc. on July 28, 2017:
Repaint 5 times.

From Richard Fost of ArchiTech Consulting Inc. on July 28, 2017:
I will say 14 times. When working for a school district in Chicago, we engaged KTA-Tator to analyze wall samples from an 80-year-old school auditorium in effort to determine why the new coating was failing in multiple locations. Final report from KTA showed the auditorium had been painted 14 times previously. The overall "assembly" was about 74 mils thick prior to new coating.

From john lienert of nehalem bay paint on July 27, 2017:
5 repaints

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Tagged categories: Coatings Technology; Exterior painting; North America

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