Patent ID: 8686091

Claim:
A method comprising: combining an isocyanate resin component and an acrylic polyol resin component with each other to form a composition, wherein the composition is in a water-based carrier, and further wherein the isocyanate resin component is 20-40% by weight of the composition, the acrylic polyol resin component is 10-20% by weight of the composition, and the isocyanate resin component and the acrylic polyol resin component are present in relative amounts with respect to each other such that the composition cures under ambient conditions to form a material having a write-erasable surface, which material has at least one characteristic selected from the group consisting of: a Sward hardness of greater than about 25; a Taber abrasion of less than 150 mg/thousand cycles; an elongation at break between about 5 percent and about 400 percent; a sag resistance between about 4 mils to about 24 mils; a contact angle measured from a surface of the material using deionized water of less than about 150 degree; and combination thereof, which material is further characterized in that, when its surface is written on with a marking material comprising a colorant and a solvent, the solvent comprising one or more of water, alcohols, alkoxy alcohols, ketones, ketonic alcohols, esters, acetates, mineral spirits, or mixtures thereof, the marking material can be erased from the surface of the write-erasable material to be substantially invisible for more than 100 cycles of writing and erasing at the same position.