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This blog is written by Rich | 22 entries so far

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UV in the Shop #2: Finding Flaws in Finish

02-16-2018 06:32 PM by Rich | 3 comments »

Another thing that conveniently fluoresces in the shop is finish. Most finishes I’ve tested fluoresce to some extent — some more than others. Shellac, for example, glows a bright orange. Oil based products exhibit different shades of yellow-green, and waterborne products have a slight bluish hue to them. The real significance of the effect is that it varies with the thickness of the finish on the surface. This allows you to quickly locate flaws in the finish very easily. These are often not visible except at certain angles, so finding them generally involves trying to reflect light at just the right angle, and feeling for them with your fingers. Fortunately a good UV flashl...

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