These days dry mounting tissues have changed, I've still got quite a large supply of Ademco (The Adhesive Dry Mounting Company) tissue left that I bought more than 35 years ago, I was given an Ademco dry mounting press when a local newspaper switched to RC papers in the 70's. These older tissues are shellac based and it was always recommended that the tissue be cut slightly undersized 1/16th of an inch on all sides, they required quite a bit of heat and pressure to get the best results. Slightly too long or too much pressure and the adhesive could bleed badly if cut to the exact size.
Originally Posted by Vaughn
PE/RC prints couldn't stand the heat required for the older tissues so a new generation of lower temperature tissue were introduced and presses have changed as well.