On my puncture last year, I used the cars gunk and went to Kwikfit, new tyre authorised (also after an absolute age on the phone to Motability by the fitter) and a new can of gunk handed over to replace my used one. First time that’s happened, but very welcome.
If you do use the cars gunk, you don’t need a new inflator, it remains fully useable afterwards.
In life, it's not who you know that's important, it's how your wife found out.