A customer of ours brings in drawings that are pastels with collage and acrylic medium on heavy drawing paper, about 22x30. We want to float mount it to show of the deckled edge. I’ve tried Japanese hinging, but I’ve found it frustrating to sped time getting the paper in the exact right place, attaching it, only to find out that’s its moved just a little. Is it ok to use put acid free plastic tape on the back of the art, then put silicone glue on that tape and press that on to the mat board? I do this in two places near the top. Another question is how big do the spacers have to be? No works on paper hang perfectly flat and some seem to hang further out than the others. Is it very bad if one corner touches the glazing? If its not touching now, does that mean it won’t move 1/32 inch out later? This customer won’t spend much so any tips on reducing the time spent while still preserving the art would be much appreciated.