What is the difference between TheMagicTouch T.Seal and TheMagicTouch Release Paper?

TheMagicTouch T.Seal pushes the transfer film deeper into the fabric that is something Release paper cannot do. Because the transfer is deeper in the fabric you will get better washing result using the T.Seal. But with some toner types you cannot use T.Seal because of the pigments in the toner, then use release paper.