Black waterproof panelboard (also referred to as: "black waterboard", "door panelboard", or just "panelboard") is used to make door panels, kick panels, package shelves, sail panels, and other interior pieces.
Waterproof panelboard is made of tightly-grained chipboard, and is approximately 1/8 of an inch thick. It's (mostly) waterproof, bendable, and can be sewn, stapled, and glued. Sheets are available in various sizes, including 32"x48" and 39"x65". Prices range from $5-25 per sheet, depending on the supplier, the size, and the quantity purchased.
 Cutting black waterproof panelboard
Black waterproof panelboard is best cut with a sharp utility knife. Saw blades tend to chew it up and make poor working edges. When making holes in it, it is best to use arch punches of various sizes.
 Sources for black waterproof panelboard
Because of its size, panelboard is often not economical to have shipped.
Some suppliers may only sell in larger quantities, or don't sell direct to consumers.
- Restoration Specialties -- 2007 Catalog (PDF)
- Interior Supply and Services
- Miami Corporation (doesn't sell consumer-direct)
- Black treated waterproof panelboard, from Perfect Fit McDonald
- Fabric Supply (doesn't sell consumer-direct)
- Black waterboard, Hotrodders Bulletin Board, September 28, 2007.