PSA is just going to give you more hardness & opacity. UA is also for hardness & opacity, but will also help the oil bind to the wax & increase the burn time. So, w/ both these additives increasing hardness, there's no way I can use 1oz BW -- the wax cracks. I think the BW & UA both work to give you better throw. In truth, I really have no need for the PSA & UA together, but I don't want to retest a new formula right now. Susan.