My audio friends and I have used the Q45T for the past several years. Yes, it is expensive, but it is the finest sounding of all the contact enhancers including Total Contact, Quicksilver Gold, that we have tried. Apply once and probably the only time you’d ever need to apply it again would be on AC plugs that you occasionally disconnect from the wall outlets prior to a storm. I’ve disconnected my 4 plugs from wall outlets about 15-20 times over the course of using the Q45T and still haven’t felt the need to reapply. The stuff stays on well and remains slightly moist so no drying out. The sound just keeps getting better the longer it’s on for up to 4-6 months. You can argue with my opinion, but who cares. Try to find a better spent $345 for the gain in SQ in other ways. If your system is not seriously extensive, you can share a bottle with 2 and maybe 3 friends and hit ALL the contacts.
Bob