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Wet spots appear on my soy jars two days after they cure fine Troubleshooting
Pouring a soy container wax into 8oz straight sided jars. They come out clean and fully adhered, then 48 hours later there are patches where the wax has pulled away from the glass. Room stays about 20C, pour temperature 57C, jars not preheated. Does anyone actually solve this or is it something you live with?
@clickertrainbee · 9mo ago · 3 replies
You mostly live with it, but you can push it a long way down.
It is thermal contraction. The wax shrinks as it cools, glass does not, and adhesion fails wherever the bond is weakest. Warming the jars to about 40C before pouring and then cooling slowly - a cardboard box over the whole batch overnight - gets me around nine clean jars in ten. Pouring hotter does not help; pouring into a cold jar in a 20C room is the main culprit.
Also worth saying: wet spots are cosmetic only. They do not affect burn, throw or safety. Commercial soy candles have them too, they just get sold before anyone notices.
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@clickertrainbee · 9mo ago
Oven on its lowest setting for ten minutes, then out onto a towel. A heat gun gives you uneven jar temperature, which just moves the problem around the glass.
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@cure_rack_cody · 9mo ago
A box over the batch is easy enough. Do you preheat with a heat gun or the oven?
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