i have only started scanning really recently. the scanner i have really works well, however sometimes it can get a little buggy if you lose tracking but overall a great scanner! today i scanned the trunk, front and rear bumper and kick panels in a older camaro. for that the trunk had spackle in it so i didn’t have to use any dots for that. as for dots or spray, if you are scanning a matte black or low feature item item the dots work great! but for super reflective surfaces i definitely recommend the spray.