You could add Beeswax however it is costly. I would try the gw444 and perhaps mixing a little of the Ecosoya Pillar wax but only if it gets to the point where your candles are being destroyed to the point where you can not sell them. Hopefully the heat wont play a factor this year.
Anyone have any ideas for a summer show. I guess this is what you would call it candle making block.. I really don't want nothing that would melt. Like the last show i did in June of last year.
Have you considered using beeswax as the melt point is so much higher for summer candles. Or I add a hardener to something such as ornaments that I want to last in extreme heat.