Is it a brick wall, block wall, drywall, sheet rock, stucco, wood...... ??
Use a French Cleat and be done with it.
I need to mount a 12"x18" pvc sign to a painted wall in a Hospital, customer would like it to be installed without drilling holes, does anyone know if the walls use a special type of paint or coating that will conflict with VHB or Foam Tape?
It's painted drywall.