The secret to Artfix's exceptional quality and smooth surface lies in their unique protective formula that isolates each individual fiber. This sealant prevents the acid in oil-based primers from penetrating and destroying the canvas over time. After the sealant is applied, as many as four layers of oil-based or universal (acrylic) primer are applied, ensuring that paint will permanently adhere to the canvas without cracking, peeling or flaking when utilizing professionally accepted standards. Artfix offers a conservator-grade painting surface that, when treated properly, preserves finished art century after century. It is this close attention to detail that makes Artfix a premium product for artists. P72 is a lightweight very tight weave polyester with beautiful grain. Excellent for portraits and detailed artworks where the lighter weight and long term stability is important. Polyester is recommended by conservators.Details:White85" x 11 yd.Fine and even grainLuminous undertonesIt has a white finish on the back