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This document presents annotated forensic paint failure lab investigation photographs - paint test laboratory photographs of severe paint failure on a wood sided pre-1900 building in New York.
This article describes
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Daniel Friedman - InspectAPedia.com
The accompanying photographs taken in our forensic lab provide examples of paint contaminants or other conditions associated with paint failures that can be of assistance to analysts investigating paints on buildings, artifacts, and works of art. Each caption pertains to the photograph below the text.
[Click to enlarge any image]
Paint lab photo - 001 (below) polarized light showing mineral debris (road dirt) in paint layer
A painter skim-coated old paint on the wood siding using 40 gallons of Sherwin Williams C-70 crack and hole filler - followed almost immediately by a rapid and extensive failure of the new painted surfaces was evident in less than 90 days.
Extensive stripping and surface preparation will be required to restore the building whose paint failures are shown in these micro-photographs.
As a paint surface shortcut, a skim-coat product, a substance intended for small crack and hole filling, was used in violation of the manufacturer's instructions, resulting in extensive paint failure throughout the building exterior.
Paint lab photo - 003 mineral debris (road dirt) in paint layer
Paint lab photo - 006 pigment removed from surface during adhesion test
Paint lab photo - 007 mineral debris (road dirt) in paint layer
Paint lab photo - 008 road dirt and debris
Paint lab photo - 010 mitosporic fungi on back of paint chip suggest surface was not cleaned prior to painting
Paint lab photo - 013 debris in paint layer
Paint lab photo - 014 mineral debris (road dirt) in paint layer
Paint lab photo - 015 mineral debris (road dirt) and organic debris in paint layer
Paint lab photo - 016 stereo microscopic view of solvent blisters in paint chip
Paint lab photo - 023 plant hairs & fibers on back of paint chip describe level of surface cleanliness at time of painting
Paint lab photo - 024 paint droplets in an indoor debris sample - probably during spray painting of the interior
Paint lab photo - 026
Paint lab photo - 028 mitosporic fungi and road dirt debris on back of paint chip suggest surface was not cleaned prior to painting
Paint lab photo - 029 mitosporic fungi on back of paint chip suggest surface was not cleaned prior to painting
Paint lab photo - 030 pollen and plant fibers on back of paint chip suggest surface was not cleaned prior to painting
Paint lab photo - 032 Periconia sp. mold spores and other debris on back of paint chip
Paint lab photo - 033 cratering indicating solvent blistering on a paint chip sample
Paint lab photo - 035 burst solvent blister and debris in a paint chip sample
Paint lab photo - 038 high magnification of solvent blister eruption in paint surface
Paint lab photo - 040 paint sample thickness and debris in coating of this paint chip sample, low power magnification
Paint lab photo - 043 no wood hairs on back of paint chip - not a building-moisture related failure
Paint lab photo - 046 thickness of layers including skim coat material is nearly 4 mm.
Paint lab photo - 048 craters and solvent blistering - 600x.
Paint lab photo - 049 no wood hairs on back of paint chip - not a building-moisture related failure
Paint lab photo - 050 cross section of paint blister - stereo microscope
Paint lab photo - 051 mold and debris in skim coating
Paint lab photo - 052 cratering indicating solvent blistering
Paint lab photo - 053 cratering indicating solvent blistering - 600x
Paint lab photo - 054 mold on back of paint chip
Paint lab photo - 056 cross section of paint layers, newest layers up - 600x
Paint lab photo - 062 shows layer thickness as well as separation of top coat from thick skim coat of Sherwin Williams C-70 crack filler (not a product defect - the product was not applied according to the manufacturer's instructions) - newest layers at left.
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.
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