To all those who are annoyed that it is not erased on chalkboards, this is the case with all chalk markers. The product isn't to blame, especially since the packaging says it's only for use on non-porous surfaces. However, I have a tip. You can buy chalkboard sealers to use these (and any chalk markers) on them. Check out Revain's Clear Acrylic Spray Sealer. These are excellent markers with no non-porous surfaces.
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