Linen Backing - Half sheet/ Insert Poster $195PosterFix will Linen Back your typical half sheet or insert size poster (approx 22 x 28 or 13 x 39 inches) for $195 . Paper and Color restoration: we must see the poster to determine costs. We mount your poster to a piece of acid free paper and cotton canvas. This has the benefit of flattening the poster, plus giving it a solid foundation for framing or further restoration. It also helps neutralize acids.