Recently I placed a request looking for someone who might like to do an exchange of a quantity of SPG and some 45/70 cases for a Russ Weber breech seater.
I have received a reply from a gentleman who is interested in such a trade and has a quantity of Tropical SPG. I have only ever used the normal SPG and am wondering what the difference is between it and the tropical and the normal stuff as I don't want to end up with something that may be unsuitable for my use here in Australia.
Mike.

I've been using SPG Tropic since its introduction. Here in the Arizona desert, regular SPG turns gooey at about 90 degrees F. For my .38-55 Ballard I use Tropic as both bullet lube (pan lubed with SPG Tropic) and pre-cut lube wads, I can leave ammo out on shooting bench top (in the shade) and continue shooting at 100 + degrees. I normally shoot that rifle with duplex charge of 5.0 grains SR 4759 and the remainder of the case filled with Swiss or Olde Ensford with a card wad in the case mouth. I breech seat with a card wad at bullet base plus a groove diameter SPG Tropic about .09" thick. I have shot that load dirty for 65 continuous shots with no degradation in accuracy.
Tropic has a different consistency than regular SPG. It is harder at room temperature similar to candle wax but not quite that brittle. I think it's good stuff.