Clurthebur

I'm looking for a paraffin wax blend that doesn't frost up. I've been using the Michael's ArtMinds paraffin wax for pillar candles, and have noticed that after a few months, the candles have started frosting. I've tried a few other paraffin waxes, but really like the opaque-ness of the Michael's brand. Does anybody have any suggestions on other brands that might not have this issue?