Lady Jaye wrote:Cardboard is tricky stuff, make it too moist it will rip, crease, loose ink.
Put cardboard on flat surface, place under towel, printed side facing down, gently steam iron or iron with moist towel. When still damp-ish put between something heavy and leave for a while.
Moist is also the main cause of warping and bending! So be carefull!
Thanks, it looks like this may be the only way to amend this and I will post some pics of the end results when I get that far.