I never prewash fabrics. I use spray sizing and a steam iron. I could not get the panel straight. I used a square in the
corners and straightened it best I could. First I trimmed off some of their borders that came on the panel. I then started to add my own [ATTACH=CONFIG]526382[/ATTACH]border strips. After each set of borders I would again use a square and trimmed. At the end the panel was still not perfect but much better than when I started.