I pour 3s and some 4s. On the M38, I didn't put any additives the first go around. I don't much care for the 343, but I didn't give it that much of a go. Just enough to make me curse. I thought it tended to hamper the consistent mottling more than help. With 1274, I added steric. I just seem to get a drier candle with it. I've had it work for me at 2 tsp. to 3 T. Alot of the results had to have been due to the humidity or temps of the seasons. Other than that, I stick UV in everything.