Why is there a whilte outline to my strokes when I paint on the top layer? Note that this is not just a tracing image that it is applied to the canvas. This happens without this image applied as well.
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Why is there a whilte outline to my strokes when I paint on the top layer? Note that this is not just a tracing image that it is applied to the canvas. This happens without this image applied as well.

This is due to a technical restriction.
K, one layer it is then. 