One of my favorite tricks is to apply blue painter's tape to the wall to protect it. Then adhere to that using a super heavy duty tape - VHB or velcro are good. I'm not sure if the painter's tape will hold up in your humid environment, but it's worth a try.
Also, newly painted walls can off-gas for 5 days or so. So, let the paint dry as long as possible before you try to adhere the labels.
I'm assuming you are printing in-house. You could also have an outside vendor print them onto 3M repositionable vinyl, which would not be too expensive and would save you the cost of the tape which can be very pricey. Again, you'd have to test this out. A printer also might be able to offer you some other products that are resistant to humidity but won't damage the walls.
Please post if you find a solution - I'm curious to know what works in your case.
Best wishes,
Johanna
--
Johanna Goldfeld Design, LLC
Graphic and Exhibition Design
Tel: 718-789-1238
Visit my website: www.jgoldfeld-design.com
Read my blog: www.jgoldfeld-design.com/blog
Sign up for my newsletter: Pointers - Tips, ideas, and inspiration from the world of exhibition and graphic design
------------------------------
Johanna Goldfeld
Exhibition & Graphic Designer
Brooklyn NY
Original Message:
Sent: 10-23-2015 10:05 AM
From: Susan Barnett
Subject: Adhering Labels to Drywall in a Humid Environment
You could experiment with using 3-M ATG tape (Adhesive on a removable backing applied with a roller gun). Usually it sticks better to paper than paint and does not take the paint off, but it depends on the paint so try it in an inconspicuous location - leave a label up for a month or two and see what happens. If it does stick too tightly you could dribble UnSeal to release it without leaving a stain. There are two varieties of ATG tape: the regular is stickier than the gold. There are also removable putties available but they can leave an oily residue on flat or eggshell surfaces.
------------------------------
Susan Barnett
Creative Arts Professional