I made some small boards using thermal toner transfer and noticed when cleaning the surface with a ScotchBrite pad, that it is not glass-flat. They were very clean when they arrived and had no scratches But there is some slight texture to the surface that you see when first start cleaning. After scrubbing in all directions it seemed fine. I got pretty good adhesion and etching with a mix of line widths down to .020/.015” lines and spaces. I always make more than I need and about 70% of the boards etched cleanly.
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