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How to Check If Your Chalkboard Is Non-Porous
If you’re using a chalk marker to write a checklist or advertise a special, you want to make sure that you can erase what you’ve written or drawn. As a rule of thumb, liquid chalk can be removed from non-porous surfaces like glass, metal, whiteboards, and other surfaces that don’t allow air or water to pass.
But what about chalkboards? Many chalkboards are made of wood or slate, both of which are porous and will absorb the colors from your marker. If you’re not sure what your chalkboard is made of, it’s recommended to test it first. Here’s how:
If the mark goes away eventually, good news! Your board is non-porous and you can use it over and over again. However, don’t fret if you have a porous surface. Sealing the board with an acrylic spray or other aerosol sealer will make it perfect for showing off creations that are easy to clean.