The material we paste on glass is just a kind of common tissue paper,
since it help us to get a more smooth surface, (no so much rag)
it’s ok, you really needn’t worry about the paper, you just need to make it wet,
and then paste on the surface of glass you want to engrave.
for Thermark, yeah, it’s useful for engraving on metal,
and after you get the laser job down, you can tear the Thermark off,
(there’re 3 types of Thermark, you can visit their website if you like to learn more)
then you can get a clear pattern/words on metal.