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Message: <blockquote data-quote="Fast Learner" data-source="post: 1186932" data-attributes="member: 649">For making a grid on an existing whiteboard the best (by far) technique I've found is to simply get a large straightedge (preferably metal) and score along it (cut through the surface of the whiteboard) using an x-acto knife. This will result in a very thin line (of course) but the first time you write on the board and then erase it the little dry erase bits will get stuck in the crack and produce a beautiful ultra-thin-but-very-visible line. Use a very sharp x-acto and replace the blade regularly and you'll get such a clean cut that the eraser won't ever "catch" on it or anything -- just a great black line.All other methods I've tried have failed because the liquid chemical in dry-erase markers seems to remove anything you put on the board: permanent marker lines come right off immediately and paiint wears off after just a couple of swipes.</blockquote>