I made full page decal sheets, using Avery full sheet label #8665 and my ink jet printer. Sprayed a clear coat "shake can" sealer over these sheets & let them dry over night.
Best method is to use the fonts you want, and then put a border totally around the label to cut to. Mine have been stuck to the panel for four years now.
You can even do some "fix it" tricks with these labels. I had to replace the Cessna type alt/battery switch & scratched the panel around the switch, when I pulled it out. I made a new slightly larger alt/battery decal which surrounds the switch, and filled it with grey color to match the panel.