Totally depends on size of text and also colours used and number required to a degree
Normally something with a letter height above 10-12mm would be a pre-spaced cut vinyl, this comes with an application tape so no need to fit single letters, all fitted in one section
This is durable and can be clear coated if you wish as long as the frame is not oven baked to cure the clear coat
Lettering smaller than 10mm or with fine detail would be printed onto a clear base and cut to a 2mm outline profile, same as above applies for clear coating
Lots of other options, drop me a email for more info 🙂