Ampersand - Gessobord - Flat Panel - 18x24 - Save hours of applying and sanding gesso with Ampersand's perfectly hand-crafted Gessobord. The thick acrylic polymer gesso ground has been sanded to an exceptional finish youÆll love. Gessobord panels are perfect for layering, glazing, alla prima and impasto in oils, acrylics, alkyds or water-based oils. The surface of Gessobord is pH neutral and acid free. All Ampersand Panels are handcrafted of a superior quality hardboard and coated by hand with acid-free premium grounds.