We only use materials supplied by Hotpress uk, who are recognized in the art and photographic world as one of main manufacturers of both mounting equipment and materials. They also are members of the fine art trade guild.
The hotglass vacuum press that we use can flatten work and even to a certain degree remove creases.
We can also permanently stick canvas works down to a rigid substrate instead of stretching. This can be used where the image goes quite close to the edge of the canvas or the image is liable to cracking if it were stretched.