JTech and Glass Subway tile question

Good evening, I am hoping someone has successfully etched a glass subway tile with a 7W JTech diode. I purchase a 4X12” glass subway tile from HD and attempted to etch a backwards black and white comic book image into the bottom paint of the tile. I attempted at 40 IPM x 80% power but laser had no effect on paint or glass. Then tried again at 20 IPM X 100%, and a third attempt at 8 IPM X 100% all with no effect on tile. The laser is firing and operating in all respects. There is slight bleed on one edge so I am getting engraving into my mdf wasteboard. Thanks for reading I am hoping to get some help with settings or setup or … if you have been succesful with this I would appreciate any help.

It sounds like you have a layer of paint on one side of the tile and that you’re trying to engrave “through” the glass surface to the paint layer below. If that is the case, the laser is getting diffused within the glass, so to laser it, you would want to flip the glass with the paint side up, and would subsequently need to flip the image to be engraved or it would come out reversed.

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I thought that was exactly what he was trying to do based on how I read his question.

“I purchase a 4X12” glass subway tile from HD and attempted to etch a backwards black and white comic book image into the bottom paint of the tile.”

I haven’t had a go at this yet, but it is in my list of ideas to play with. I may have to move it up the list if I have time.
I have seen folks have good results with Tempera paint, I don’t think brand matters so much as color. Needs to be black from what I can see. Paint side facing laser for etching. The other thing I keep seeing, and will be doing myself is to raise the glass off of the bed just a little, and placing something under it, maybe just a scrap piece. Don’t know if any of this will help.

Thanks for the replies. Ok yes I was trying to etch through the paint in the bottom. This is a technique several people use on YouTube. However I was unable to engrave through the paint. However I tried another technique and had quite good results. I used Cold Galvanizing spray on the glass and used 80% max power at 50 inches per minute. The etch is deep and dark.The etching has a very nice drop shadow as well, Overall I am pretty happy with this technique.


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One more thing the comic book page came out nice too but the thin lines are not as striking to me because the shadow makes it look very busy.


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Great results!
Did you do paint side on top, or paint side on bottom for this?
I have a couple of cans of cold galvanizing spray on hand so this could be fun. Just have to finish making all the freaking tile coasters first. lol.

I did paint in bottom galvanizing spray on top.

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