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Old 03-10-2018, 08:35 AM   #19
wwhitney
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Join Date: Dec 2015
Location: Berkeley, CA
Posts: 1,020
No, that would only be true if you held your trowel perpendicular to the substrate. You need to multiple the result by the sine of the angle at which you hold your trowel. For a 45 degree angle, it would a multiplier of 0.707.

Cheers, Wayne
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Wayne
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