Use 3M™ Super 77™ Multipurpose Adhesive...
Here's what I've done when using Fabricbrite Banner Material, which is a similar acting substrate (A polyester adhesive-backed fabric that you can cut with your existing plotter. Use to add graphics to awnings, flags, table covers, boulevard banners, sails and other cloth signage.) It's hard to get application tape to stick to it, so I lightly spray 3M Super 77 Adhesive to the face just before I add the application tape. This will give it the bond you need!
Do this just before you are ready to apply the PhotoTex to the wall. Don't let it set and dry to the application tape. Use it quickly to hold the application tape and then transfer the PhotoTex within 5 minutes to the wall and remove the application tape. Works for me everytime, but you've got to be fast. Otherwise, you'll spend alot of time getting the application tape off the PhotoTex.
Try a test and see how it works.
Good luck.