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Your Host and Tour Guide:
Paul Oman, MS, MBA - Progressive Epoxy Polymers, Inc.
Member: NACE (National Assoc. of Corrosion Engineers), SSPC (Soc. of Protective Coatings), Dept of Defense Corrosion Exchange (www.dodcorrosionexchange.org)
"Professionals helping Professionals"
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Wet Film Thickness Gauge
Keep this handy plastic gauge in our tool/paint box to measure (in microns or mils) the thickness of your newly applied (still wet) coatings. Useful to compute coverage rates as well as film thickness.
This 1.5 inch by 1.5 inch plastic gauge measures the thickness of wet films in microns or mils (1,000 mils equals 1 inch). 1 mil of any coating will cover 1604 square feet. At ten wet mils a gallon of any coating will cover 160 square feet. This gauge measures from 2 - 32 mils. These gauges are commonly used to estimate coverage rates (or of course, coating thickness).
Carefully insert an edge of the gauge into the wet coating. If the coating is visible on the prongs or teeth of the gauge the coating is thicker than what is marked on that particular prong. If no coating is visible on a prong, the wet coating thickness is less than the labeled thickness for that prong. Of example, if the 8,10,12,16 mil edge is placed in the coating and the coating is seen on the 8 and 10 prong but not the 12 or 16 prong. The coating thickness is between 8 and 10 mils.
With solvent free coatings (0% VOC , 0% solvent, or 100% solids) wet film thickness equals dry film thickness.
A coating that is 50% VOC will have a dry thickness half of its wet thickness. A coating that is 25% VOC will have
a dry film thickness that is 75% of the wet film thickness.
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