Fredrix Watercolour Canvas is a durable woven material which is acid free and archival. It can be framed with or without glass. To frame without a mat or glass, we recommend that you spray the painting with an artist quality UV finishing spray. If you paint on our pre-stretched canvas, you can paint on the staple-free edges and Hang without a Frame! With or without glass, the finished painting will offer a unique, fine texture unlike any paper.