Too bad that is not pointed directly in the product description that a wave form of the canvas in this Manufacturers part of the standard. When I complained regarding the wave formation and forwarded a photo via e-mail for review to the seller, answered me the support that I so would have happiness and the curling was on my canvas not very pronounced. At the latest when this answer was clear to me that I had bought the wrong. Moreover, I was informed that such kind of canvases always have a wave form. Another response that can stop more and serves to imply that an alternate canvas, possibly from another seller has the same problems and I therefore could remain the same at this manufacturer and the waving of me simply wegdenke. That might bear fruit at first-time buyers of screens, but my old canvas has nähmlich 0% curling and ranked in the same price structure, but is worlds better in the processing. Fact Namely, that the shaft and the frame in the construction with my old canvas is stiffer and can not be twisted, in this screen, however, the plate and the shaft is made so thin that bends the material, then it is later also normal that the screen has to make waves because the Earth's gravity is too strong and the shaft sags, so what more for the lives on the moon, so then no good for me. I can not understand how this product can have so many positive reviews, which had led me ultimately to buy.
