From XGX website:
Remove all dirt, oil, and grease with soapy water. Once they're clean, do not touch mounting surface, the oils in your hands will affect adhesion. This is the most important step in successful graphic application. If you are applying to new plastic or paint, lightly scuff application surface with fine steel wool or scratch pad.
· We recommend spraying or wiping a soapy water/alcohol solution onto the plastic to allow the graphics to slide around before final placement. Some types of Window Cleaner will work as well.
· Align graphic with any interior holes, this is usually easier and more precise than using the perimeter.
· Lay plastic down on flat surface.
· Lightly place the graphic on the plastic. Do not push down on graphic until alignment is finalized. Do not try to slide graphic to proper alignment. We use a pressure sensitive adhesive, which allows for peeling and replacing if pressure is not used. M
Once you are happy with the alignment, begin applying pressure to graphic beginning at the center and moving outward to the edges, pressing out fluid and being careful to press out any bubbles. We suggest using the backing paper between the graphic and applicator to avoid "digging in" to the vinyl. Be sure to apply ample pressure especially at the edges. Allow graphics to sit for 24 hrs. prior to riding. We also advise re-applying pressure to the graphics after a couple of hours, especially if using an application fluid to ensure complete bonding.
If you encounter bubbles that cannot be rubbed out, take a sewing needle and prick the bubbled vinyl a number of times and reapply pressure. This allows the air to escape and the graphic to contact the plastic. If you are having trouble getting the graphics to stick on to the plastics, try using a heat gun or blow dryer. Make sure you don’t get it too hot, or it may melt the graphics. This is just helpful to let the liquid underneath evaporate to allow the graphics to ahere to the plastics and conform around the edges.