Will glue sticks form a barrier on a build surface to prevent PETG from damaging the surface? Will glue sticks, such as Elmer's All Purpose, Cra-Z-Art washable or Scotch Permanent, form a barrier on a build surface to prevent PETG from damaging the surface?  While forming a barrier that holds the PETG print down, does it allow the PETG to separated after the print finishes, so that the build surface isn't damaged?
I found in the description of a glue stick designated for 3D-printers: &quot;these 3D printer glue sticks can be applied to remove 3D models much easier .. made of quality PVP material ... have nice adhesion to hot plate or hot bed, easy to remove the printing models ...&quot;
I'm now using an Elmer's washable school glue stick (PVP).  It is working consistently at bed temperatures of 30°C and 80°C. It both holds the PETG print and releases the print without destroying the build surface.
I don't know about PVP but PVA sticks more at room temperature and gets weaker at higher temperatures, see &quot;Influence of temperature on the strength of bonded joints&quot;

I remember using hairspray with PVA for PETG and it was really difficult to detach large parts.