How to paste tissue paper onto thicker paper?
If you have access to a roll press (etching press), an option would be to use stick glue (if the tissue paper will be pasted all the way on the thicker paper apply the glue on the thick paper, if there will be margins apply it carefully on the tissue paper; either way I'd suggest you use a slightly wider sheet which could be trimmed later to the desired shape and size. Also make sure all the area is covered in glue - where there is no glue a 'bubble' will be formed). Then run it through the roll press.