If you've tested the Res-Q-Me blade on a seatbelt, shouldn't you replace it with a new one? I ask because their website says:

"Is ResQMe good for more than one use?
Yes. ResQMe automatically reloads itself after being activated allowing for multiple uses. The blade, however, will become duller after each cut or slice, and we recommend replacing the tool after one use to keep the blade sharp."

That's why I haven't tested mine...