The RayMar Panel is a professional quality painting panel. We mount cotton canvas on 1/8 inch hardboard through a commercial process with a pH neutral adhesive to bind the fabric and panel in a uniform way. Next, we cover the reverse side of the panel with a gray melamine finish. This creates an acid-free archival art board that resists warping and provides a permanent barrier against deterioration from moisture or mold. This process creates an affordable, museum-quality painting board for artists. Important features of the RayMar Art Plein Aire PanelTM:• Professional quality• Commercially produced• 1/8th inch hardboard• pH neutral adhesive• Permanent barrier against moisture and mold• Canvas adhered uniformly• Melamine impregnated backing balances panel to resist warping• 100% archival museum quality