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We recommend these Staedtler® brand markers.
Water-based overhead-projection markers work best on our vinyl mats as they are designed for plastic. DO NOT use grease pencils, permanent markers, or dry erase pens on the mats. The vinyl surface is too porous to allow for easy removal. It is recommended to first test any new pen on a small area such as the border, and wait at least 30 minutes before wiping off to insure that color wipes off properly. Often the colors that stain are not constant due to small changes in the manufacturing of the markers, so it is good to do this test whenever you get a new pen.
Please note that red markers from any manufacturer tend to stain quicker than other colors, so use sparingly and mainly for highlighting. This applies to the red pen included in the Staedtler® 6-pack.