I was asked to try clear glass cans in the HTVRONT Auto Press and here are my results. I also did a frosted glass to compare. I used 380F for 240s and did not turn them. Also used the shrink wrap sleeves. Hope this helps! Edited to add: I used shrink wrap because I had seen HTVRONT post a video using it and I had tried it with the tumblers in an another video, and so I wanted to try it with glass. It’s NOT required. | Michelle's Party Plan-It by Michelle Stewart