I do something similar to warn folks that there are free-flying parrots in my greenhouse, and to enter with an escort. It is a printed sign inside an archival page protector.
I have found that I have to replace the sign about every six months because it fades to nothing. It is facing East. I just use a regular inkjet printer.
For my "for the guests" plant tags with common and botanical name, I use a paint pen. Lasts waaaaay longer. For my acsession tags, with the info that I need, i use the embossable aluminum tags and probably the exact same die set as GrowInFlorida. $10, Harbor Freight.
Cheers,
Carolyn