We all know squeegee blades come in rolls. You chop a piece off the roll, and secure it to a handle.
Being stored on rolls will, over time, cause the polyurethane to develop a memory, so that when it's straightened out, you'll still see waves from the rolling.
I've got three or four squeegees (14" and above) that are noticeably wavy along their length, presumably as a result of this. It's difficult to get a good push stroke, and almost impossible to get a good flood.
Any of you had issues with this before? The squeegees are from Ryonet, so I'm not sure if it's just because they were made on the cheap, if I got the end of some rolls, or if this is a common problem.