I find these Do It Yourself plates work best with de-bossing & the effect is a little more like the letterpress look...
Just 2 simple steps:
Step 1) Layout any grungeboard pieces you like on a piece of cardboard
Step 2) Lay down a layer of Mod Podge Matte & stick the grungeboard to it & coat the pieces in a little bit of Mod Podge Hardens so nicely for crisp edges. (I like to work in stages so there's no blobs.)
Let dry & then you can emboss with it...
It gives you a nice deep impression.
I spared Ya some of the finicky details (for once) ;o) but if you'd like to try it & you wanna read
'em, you can read the deets here (sandwich/stack to use is there if you need it):
Happy Grundgey Embossing! :O)