Hardbord is a better support from start to finish! Build up your own unique painting grounds and textures on this ultra-stable hardboard support. Its high-density fiber core is engineered for stability, eliminating the warping and bowing issues common to other substrates. Moisture-resistant and acid-free, Hardbord contains no formaldehyde or harmful volatile organic compounds, and accepts all commercial and handmade gesso grounds. Hardbord is made in the USA.