Just ordered a sample of these
Product OL177LP - Weatherproof Polyester Laser - 8.5" x 11" Full Sheet Label No Back Slit - Sticker Paper
https://www.onlinelabels.com/Products/OL177LP.htm
Which you can also get at Amazon for 24.94 for 25
Online Labels - Waterproof Polyester Sticker Paper (OL177LP)
You can order some samples for free (i.e. 3 sheets):
https://www.onlinelabels.com/samples
And here is an Alternative:
Product OL9805LP - Weatherproof Polyester Laser - 7.5" x 10" Labels (not full sheet, slits on back…)
https://www.onlinelabels.com/Products/OL9805LP.htm
I’ll report back here once I cut some… If it turns out good, maybe a moderator can move this to the “Tips and Tricks” section…