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Sherwin-Williams’ Dry Erase Coating is a clear, glossy coating that can be written on with a dry-erase marker, then wiped clean with a rag. The two-component product is meant for professional application, as it must be agitated at low power for two minutes after mixing. It can be applied over any painted surface in good condition, has a 1 1/2-hour pot life, and takes three or more days to dry. Coverage depends on surface porosity but ranges from 200 to 400 square feet per gallon. A one-gallon kit costs $500 and a quart kit $150, which works out to $1.25 to $2.50 per square foot.

Sherwin-Williams, 800/474-3794, sherwin-williams.com/home-builders.