PERC containing GOOP is still available in the U.S. as the industrial product (from the same manufacturer) E6000. Not only is it non-flammable, but it is lower viscosity to begin with and doesn't harden in the tube over time, at least not at the rate that the retail stuff does. You will not find it in retail stores, but the manufacturer does have a web site, though e-bay prices are usually cheaper than theirs. Just search E6000. Cheapest supplier I've found so far is a Hong Kong wedding-decorations supplier: LiNg's moment info3@lingsmoment.com
http://www.ebay.com/itm/ws/eBayISAPI.dll?ViewItem&item=120783551503&ssPageName=ADME:X:RTQ:US:1123
Great stuff also for strain relief and insulation of wiring: non-corrosive and you can un-solder right through it as an iron will melt it.
Ciao,
Lenny