When I put on my number plate decals, and graphics(I replace both every spring)I do exactly what your buddy said. I clean the bejeezus out of the plastic, then spray it down with a fine mist of windex. I then take a small squeegee( I got one from decal works when I ordered my number decals), and squeegee all the windex out from underneath. That allows you to get the air bubbles out easily and get everything lined up. I then take a heat gun and heat up the decals slightly and make sure I get the last of the air bubbles out, and make sure everything is stuck down good. Hope this helps :thumb: