My first tile from a color photo I have, which I ran horizontal then vertical on my laser. It was set at PWR 80/Spd 150, 300 dpi and took 3 hrs. This was a painted white tile and after done came out very grey all over. I noticed that when I took a soft cloth, I wiped off the ash residue and you can see how it came out. (If I loaded my pics here correctly.) I’m not sure if thats how its supposed to work, but maybe you can tell me do I need to coat it with something to keep the image or after wiping it off, its set in ok?