I live in SC and we know about hot sun. I dip with 2/3 parrifen 147 melt point and pine rosin 180 melt point. I havent had any greasy boxes yet. A friend bought some boxes from SAK honey out Texas who uses same mix. His boxes are 5 years old and not greasy either. Now they are slicker then painted boxes because of the harder rosin. My rosin I picked up from Diamond forestry products in Ga. I have no issues using the pine rosin. I dont know anything about the Brazilian rosin. I have over 1600.00 in tank wax and rosin. I have enough wax for a couple years. If you can get rosin or microcrystalline close enough to pick up yourself thats the way to go. I bought 600lbs of wax and 200lbs of rosin. I at least 300.00 by picking up.