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You may need to try other markers and also try waiting a little bit. They are all solvent based. If you use an alchohol based permanent marker and then go over it with another alchohol based dry erase, the alcohol will re-wet the pigment and resins. The only difference between the markers is dry erase only have pigments, no resins and hardeners, so the pigments just dry back to a powder. From what I understand, Sharpie is one of the best for permanent applications. Otherwise, tape the lines and spray paint.
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