I am not familiar with Quicksilver's enhancer, but, I would generally use such products very sparingly. I understand it consists of a liquid with suspended silver particles. The idea is that the particles will fill in the micro pits in a metal surface and thereby increase conductivity. My concern would be that the particles could migrate and create a short.
I saw the result of such a short on an Audionote amp that was being serviced at a local shop. The owner had used an excessive amount of contact enhancer (I believe from Walker) and perhaps because of the heat in such amps, the enhancer dripped where it was not supposed to go. The damaged amp had a retail price of $125,000 (actually it is $250,000 for a pair). Luckily, the short was reparable. In this instance, the enhancer was used on the socket/pins of tubes, which are particularly vulnerable to dangerous dripping/shorting. If you are using the enhancer on things like interconnects only, there would be little chance for big problems. A shorted interconnect would only mean no signal getting through, not a meltdown.
I have personally used too much enhancer myself on interconnects, which resulted in no signal getting through. But, this was the opposite of your kind of enhancer. The one I used actually was an insulator, not a conductor. It works by sealing the new metal-on-metal contact made when the interconnection is inserted against contamination by air. Too much was not good, but, isopropyl alcohol cleaned things up.
Again, go light on your application.