Tyvek material seems to be becoming popular for bellow replacement. I have been experimenting with Tyvek clothing material (thus, soft Tyvek, as opposed to hard) from a painter's apron. It works, but it is hard to form a crease in the material to get the bellow to collapse more (and move more air through the pipe). What have been your experiences? Any suggestions or thoughts? Is Tyvek used for clothing the same as that sold for bellow replacement? Thanks!