Most customers tend to burn there candles before that happens, but while im testing I always make a couple candles up so I have one for awhile and can check in on it to see how its doing. When I had my workshop and holding area in the basement (could be a bit damp in the air sometimes) I noticed this the most. In the the years Ive been making candles I have had only 1 customer call and say that happened, she had her box of candles on her back porch which was not temp regulated, so not sure if that had anything to do with it, but you start to notice patterns of when things happen like that for you. She said she burned and it was fine, just looked "Funny"lol.. I think all in all you will enjoy the wax.