My Quicksilver has stayed fresh for over six years, thus far. The trick is sealing and keeping the small container airtight, with electrical tape, around it's circumference. I also keep my complete kit in a vacuum seal bag(air removed). These guys may be able to help, with info on the products: (http://www.asi-tek.com/xtreme1.html)
Quicksilver Gold contact enhancer
Is this still available? There is one site that advertises it but my security software warns me when I select the contact page. I have bought three times previously but the product dries up before I use all of it so I would like to ensure the product I buy was recently manufactured. Is there something that can be added to thin the consistency?