Yep, that’s what I used. Buy the small bottle on it’s own as you don’t need the expensive kit. You’ll have to look around the aisle though as the stand alone bottle of the armour etch was nowhere near the kits that are predominantly displayed.
Also, a little goes a long way with this stuff. I found that on the carboys I had to let it sit about double the time recommended (like 2.5 minutes) before I got a good etch.
Also, be sure to wipe everything down with rubbing alcohol before hand to remove any oils… before you apply the stencil, and then again after applying the stencils!!!