It's funny..I started out with C3 about 7 yrs. ago or so...it frosted really bad so I switched to 415..it also frosted and I never got nice tops without heating w/heatgun..I tried Advanced..loved it...but scent throw only on certain scents...tried 464...alot like 415..imho...went back to C3 and this is where I will stay..unless something drastic happens..lol! I don't use any additives..I heat my C3 to 200* in a presto pot...turn off the pot let wax set for a day..then I turn back on to 200* and in a pourpot add color(if using)and fo(scent)and stir,stir,stir.I hardly ever have to heat the tops.I also make sure the containers are on a towel so they will cool slower. That may sound too good to be true..but it works for me.I also use tumblers for my jars and HTP wicks(tumblers) , and CD wicks(8oz.sq.mason,22oz Clinder jar that I dbl. wick). The tops don't always stay nice once burned..but as far as I am concerned...who cares.Beforei made candles I never did. Kim