They are clean, consistent, convenient, and economical. Q-PANEL steel and aluminum test substrates from Q-Lab minimize metal variability as a source of bias in critical paint, coating and adhesion tests. Cleaning and phosphating help, but they cannot overcome surface defects formed at the mill. In fact a single mill will often produce both very good and very poor surface quality, depending upon a number of uncontrolled factors. Although some commercial steel provides an excellent surface for coatings, you are just as likely to find steel which gives poor adhesion and poor rust resistance even with good coatings. The result is that ordinary steel is unsuitable for many coatings tests.
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