You are correct on STP attempting to market the product a few years ago.
Was packed in a glass tube, that you broke and applied.
Seems there were a few lawsuits over that packaging and some people being injured.
The new packaging and applicator is the tube encased in a plastic applicator, with "wings" on it. You squeeze the "wings" and it breaks the enclosed glass tube, which then soaks the built-in felt applicator pad.
You just wipe it on and let it dry, then wipe off with a clean paper towel.
There is not way you can cut your hand, have it get in your eyes etc.
However, from personal experience, don't have your nose close to it when you snap the wings, the solvent, when first hitting the air, is strong smelling stuff.
You can not save any unused portion as air is the catalist that creates the cross-linking and it cures real quick.
Ketch
:up