For records - tiny amounts are used - and subsequent detergent based standard cleaning is used to remove excess - it leaves a tiny amount of coating which has a beneficial effect - the other thing is, it contains plasticiser - aged vinyl tends to gradually lose its plasticiser getting harder, and then accelerating wear as a result - products like armorall include plasticisers, which soak into the top layer and give it back a little of its youthful elasticity....I am not sure if Armor-All a good idea? I once made the mistake of using it on my car's dashboard. It looked great, and then dust seemed to get embedded in it in a way that I could only get it off by using some detergent, whereas normally a wipe with some water would do. Oh yes, another reason not to use Armor-All on dashboards: the sun makes it outgas and stick on the inside of the windscreen. Once it is there, it attracts dust. No amount of wiping gets it off, you really have to go to town with detergents and alcohol.
Use more than a tiny amount- and you will suffer as you spend huge amounts of time trying to remove the excess from the vinyl surface!!!