I was just wondering if you must use styrene with the wax, catalyst and polyester resin. I have made several mixes today and it seems to gum up and not fully harden. I tried adding extra catalyst and it just cured almost immediately.

Styrene thins the resin and is only to be added for your gloss coat (to be polished to a nice shine). Styrene thins the resin but too much will break the resin bonds apart and therefore not harden.

Take a look at our catalyst / wax / styrene chart and you won't have any problems with your cure.