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NOTE
In conducting the test, if the sharp edge of the lead is slightly chipped or crumbled, the lead must be resharpened.
- Place the coated panel on a level, firm, horizontal surface. Starting with the hardest lead, hold the pencil or lead holder firmly with the lead against the film at a 45° angle (point away from the operator) and push away from the operator. Exert sufficient uniform pressure downward and forward either to cut or scratch the film or to crumble the edge of the lead. It is suggested that the length of the stroke be 1 ⁄ 4 in. (6.5 mm).
- Repeat the process down the hardness scale until a pencil is found that will not cut through the film to the substrate(either metal or a previous coat) for a distance of at least 1 ⁄ 4 in. (6.5 mm) .
Glenn Gibbs
Reviewed in the United States on February 13, 2020
I liked the product at first but found some dents and dings in the wheels. Not good for a test instrument, this did cause some inconsistent results but I had to use it due to the time pressure I was under.
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