Expanded 0.50g/Cm3 PVC Foam Board 18mm Waterproof For Signage
Waterproof 1220x2440mm PVC Celuka Foam Board For Construction
Amazon.com: Mega Format Expanded PVC Plastic Sheets - 12" X 12" Rigid White Sheet for Crafts, Signage, & Displays - Sintra, Celtec PVC Board - Waterproof for Outdoors Use - 1/4" 6mm