Real G -- interesting! Yes indeed, it would be a great forum for sharing that sort of info and I would hope some experts would come aboard. I've not encountered that problem before, I painted some Horizon dinosaurs back in the mid-90s and they were fine the last time I saw them (packed for moving house about five or six years ago and not yet unpacked). I used Tamiya Acrylics and certainly over ten years they seemed to be stable, and that's through Australian summers (which, to be fair, seemed to unbalance the T. rex just a tad...)
Yep, very wide choice of material. There are eBay traders in Thailand selling huge ranges, there's obviously a manufacturer in the Far East who has acquired old moulds from Horizon, Geometric, Screamin', Max Factory and such (Kaiyodo has not shown up yet...) and made them available again at reasonable prices, the repop quality looks excellent (I've collected several so far) so this is a heaven-sent opportunity to acquire subjects that went by long ago.
I hope interest develops and we can field a really interesting GB!
Cheers, Mike/Thunderbolt379