ok
dry transfer would not work, you need to rub it onto the surface and that is how it adheres.
For water slide decals you want to use a decal setting solution, you can get it all over the place. im using a 'badger models decal softening solution' myself.
It disolves the Decal so it falls into gaps and seams before it dries back into shape. It works wonders.
I use it if its on a non smooth surface or not, just to get rid of edges and lines.