Shiny = Carrier Sheet
Dull = Vinyl
But sometimes you can’t tell. So if you ever find yourself flipping a piece of HTV over from side to side, wondering which way to put it on the mat, here’s a simple trick to figure it out.
Take your weeding tool, poke it in a corner, and pull the material back ¼” (no more), as if you were going to weed it. The vinyl side is much thinner so it will bend and fold, like this:
See the poke hole in the carrier sheet? I started by poking that side, but because the carrier sheet is so much stiffer, it didn’t fold like the vinyl.
Thanks to this little test, I now know this vinyl needs to go on the mat gold side down, grey side up.