I have just done a big job (20"x32") on Flexicolour black/white and since the engraving was heavy, was paranoid about the sheet warping and going out of focus.
I knew that the 3M double-sided tape I had was nearly permanent, so I bought some carpet tape from the local hardware store and stuck the sheet down with that.
The carpet tape LOVED the back of the Flexicolour and I had a real struggle to get it off, followed by a considerable time getting the last of the glue off with white spirit (turpentine substitute).
Anyone got any ideas about a better way to stick things down?
Thanks