Hi Larry,
The best printers I have found for printing decals are Lexmark and Oki. I belive the Lexmark is made by Oki. They are not laser printers. They are LED printers. They do run hot but that is not a big deal when you use a good quality paper. Either brand has inexpensive models that will work well for printing decals.
Now for decal paper. The best I have found is Bel Decal. They sell both laser and inkjet paper. What I have found and have been using for the past few years is the Inkjet paper in my Lexmark LED printer. The colors seem to go on more evenly using Inkjet than they do laser paper. The printer software will have a variety of settings for color saturation, paper thickness, type of paper etc. In general the best settings for me have been:
1. Bond paper for paper type
2. Full saturation for color setting
You will have to experiment with the various printer settings to get the right color density which will depend what the base color paint you are applying the decal over. I always use clear decal paper and have only limited experience with white.
Finally, when using these LED printers it is not necessary to coat the decal before submersing it in water and applying it your plane. The decal film is very thin but quite durable. I have actually removed decals and repositioned them without tearing the film. Decals work best when applied to a very smooth painted surface. To get this I always spray a couple of coats of clear dope thinned enough to produce a very shinny surface only in the places where the decal is to be applied. Once applied and positioned I use a piece of tissue (Kleenex etc.) to squeegee out the bubbles and excess water. When completely dry, usually at least 12 hours spray several coats of clear dope over each decal sanding the edges lightly after the second coat until they (edges) disappear which usually happens on the third or fourth coat. Also, there is no need to mist on coats, in fact it actually works better if you put on wet coats over the decals. I only use dope for under and over coats of decals.
For an indication of how good this method can work see the thread in the electric section “Attitude” which is my latest plane. It is difficult to tell the decals from the paint even when you are close up.
Good luck and hope this helps