Added a glowforge touch to my gift for my father. I used 5mm underlayment, I got an uneven color in the engrave so I sprayed a little black to darken. Then I sanded the top layer and removed the darker wood layer and found a knot. Not what I planned, but still made it work.
I used Loctite glue. It was a gift so not sure how it is holding up, but it felt pretty solid. I thought about drilling some holes in the stainless to allow more glue contact or roughing up the surface. But that seemed like work and I was in a hurry.
Outstanding news. My hesitation was about the smooth metal as well and I though about roughing it up. Loctite Go2 is probably my favorite glue and I even have it on hand. Thanks a bunch!