Grex GXPS-475 Private Stock Primary Color Set Private Stock is a revolutionary and evolutionary paint system - made from a blend of acrylics designed and formulated for performance to give you full control on every surface imaginable Private Stock can be used on all materials, ranging from illustration boards to textiles, wood, leather, glass, metals and plastics that include HDPE, PVC, PET, LEXAN and Polycarbonate. Private Stock water-based, non-toxic and conforms to ASTM D4236 compliance standards. All colors are extremely light fast representing the highest ratings without requiring health or precautionary labeling, which makes them more fade resistant - ideal for many outdoor applications like custom painting, textiles etc Private Stock is precision manufactured for accurate and repeatable mixing of an infinite color spectrum