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Using the wrong paint - the role of incompatible paints in building paint job failure. Here we explain how and why using incompatible types of paint in successive coatings can lead to paint failure on a building interior or exterior surface.
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Our photo shows an exterior paint failure that occurred when a mix up led to both interior paints and defective paint product used on a building exterior. The white primer was intact. The color coat began peeling even during the paint job.
Paint failures can occur, such as failure of a paint to bond with a surface, failure of inter-coat bonding, or even dissolving of one paint coat by another, if incompatible paints are applied to a surface.
For example, surfactant leaching can occur if there is an incompatibility between the primer coat and the finish coat. Paint chemists formulate primers and topcoats to work together as a tested and proven paint coating system.
[Click to enlarge any image]
There are lots of examples of using the wrong paint (besides the incompatible paints discussed above.
Be sure to follow the recommendations of your paint supplier and paint manufacturer in choosing the right paint for the proper application.
This article series reviews common building exterior & interior painting mistakes, describes how to diagnose paint failures on buildings, and outlines a procedure for diagnostic field inspection & lab testing of failed painted surfaces. We include photographs of paint failures on buildings and more photos of forensic paint laboratory examination of samples of failed paint useful to assist in diagnosing the probable cause of each type of paint failure.
Readers should also see Paint Failure Case Photographs-SITE and then Paint Failure Case Photographs-LAB, and see PAINT & STAIN GUIDE, EXTERIOR for a guide to the selection and proper application of paints and stains on exterior wood surfaces.
Continue reading at PAINT on STUCCO, FAILURE
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Paint & Fiber Forensic Analysis, Diagnosis, Conservation