A standard window mat consists of two pieces of matboard cut to the same size, hinged together along the long edge, with a window cut out of the front piece. Usually, we will add a front cover hinged on (sometimes called a wrapper), called a wrapper in these instructions, making it more suitable as a basic storage mat. This will protect the surface of the matted item from dust and light, and provides a nice surface for labels.
To make a basic storage mat:
In either case, bone folder down and press under Hollytex, blotter and Plexi for a brief period. Once it is secure, attach the cover hinge to the mat as follows.
Flip the cover facedown, place the mat on top with the hinge aligned and the window mat face down on top of the cover. Carefully line up the edges, and weight the entire package well.
Place some scrap paper under the exposed un-adhered hinge cloth. You usually will not want the spine of the hinge cloth to be adhered to the mat (so that you will be able to fold the front wrapper around to the back for display). This means you will not want to apply adhesive to that part of the hinge. (You can make a fold or tick line to indicate how far to apply the adhesive to the hinge). Apply adhesive, and remove your scrap paper.
Keeping everything well aligned, fold the hinge around the back cover, pulling it taut around the spine edge but not stretching (a crepe eraser can help with gripping the cloth). Bone folder down, working from the middle to the edges so you don’t create bubbles or creases. Open the mat and make sure the adhesive hasn’t seeped into the interior.
Reclose the mat, and place Hollytex-lined blotter above and below the entire length of the hinge, add a board or Plexiglas strip along the entire hinge length, add weights, and leave to dry. Trim excess cloth.