it not normal. I also installed ray barrier at front windscreen and rear. I don't face such problem. Tiny dot or got dust is because of improper installation either it not do in dust free room or because of the installer. You can claim a new tint film. Unless it is watermark, then it need some time to recover as the chemical it not 100% dry. I suggest to put the car under the sun for one week for the gum to dry faster.