Dry transfers are a emulsion bonded "backwards" to a carrier film. They are a staple of the graphic design industry, and we call them rub downs.
The BIG problem is that they have a really short shelf life, like 6 months.
If you go into a art supply store and see transfers hanging on a rotary rack, don't buy them.
We order them to use within a week, and even then not often.
Dry transfer markings for hobbies are to be avoided, its bound to be old stock.
Look online for decal production techniques or services, even in these forums.
Bill