Hi there I'm new to candle making and I was wondering if the people on this form could answer some questions for me.
How to prevent sinkholes with my candles?
How to properly perform a test burn?
How big should my wick be with each candle?
Preventing sink holes will depend on your wax, and what type of candles you are making.
If you are using a container candle wax, to prevent sink holes, pour cooler. However, some waxes are just prone to sink holes and you will to poke relief holes and pour a refill layer.
To properly wick test is tricky. You have to do several to know you have the right wick, and again will depend on type of wax and container you are using. I typically do 3 main tests in EACH candle, so for 3 candles, I will do it this way
First candle - the correct way to burn a candle - x amount of hours per diameter, extinguishing, trimming the wick, etc.,
Second candle I will do a power burn - light it and let it burn for 8-10 hours or more.
Third candle I will burn in short burst burns - 10-15 minutes, an hour the next burn, then back to just a few minutes etc.
When my wicks perform relatively well in all 3 tests, then I will do several more tests burning the candle correctly to make sure the wick is truly the right size for my applications.
How big you wick your candle - again, this will depend on the size container, type of wax etc.,
Candle Science has a pretty good guide on their site as a starting place. Just know this will not replace testing, as I have found that although a good starting point, none have ever been exact for me, and are usually a size or 2 too big.