Your candle does not fail because of its wax, and it does not fail because of its wick. It fails because of a temperature — one number on a thermometer that nobody bothers to measure at the moment that actually decides the outcome. The crater over the wick, the wet ring where the wax pulls from the glass, the smell that is there when you light it and gone by morning: all three trace back to a pour made at the wrong point in the cooling curve, in a wax the maker never bothered to choose on purpose.

Three temperatures, not one

Every candle that gets poured runs past three temperature points, and people treat them as one. The melt point is where the wax becomes liquid — for soy GB464 that is 115–120°F. The fragrance point is where the oil goes in — for soy and paraffin that is 185°F. The pour point is where the melt meets the container — for GB464 that is 125–135°F. Each one fails in a different way when you are wrong, and almost every defect on a shelf comes from confusing the three. The sequence is the whole craft: melt, raise to 185°F, add the oil, cool to the pour window, fill. Skip the raise and the oil never binds; skip the cool and the candle shrinks.

Here is the working table I actually run against, because the numbers are the only part that is not negotiable:

Soy GB464: melt 115–120°F, add fragrance at 185°F, pour at 125–135°F.
Container paraffin: melt 115–130°F, fragrance at 185°F, pour at 150–165°F.
Pure coconut: melt 76–82°F — the lowest of any common wax, which is exactly why it overheats the fastest and is almost always sold blended.
Coconut-soy blend (GB454 family): the pour window jumps to 150–170°F because the soy raises the whole working range — the same pour point that is right for pure soy is wrong for the blend.

Hotter is the trap, not cooler

Most people assume you want to pour hot, because hot pours smooth and hot feels like it fills the jar. That is backwards, and the physics is the reason. Above the pour window the liquid contracts harder as it sets, and the contraction is what drags the wax off the glass. That is your wet edge. That is the sinkhole over the wick. Soy pushed past 145°F gives you crusty tops and aggressive shrinkage; paraffin past 165°F does the same and then leaves a divot you must re-pour. The hotter you pour, the more you fight the wax as it cools.

Cooler fails the other way, and the failure is quieter. Below the window the melt starts to set mid-pour, and you get jump lines — horizontal rings where one pass stopped moving and the next one laid down on top. Fragrance added to wax that is too cool does not dissolve into the melt at all; it pools at the bottom of the jar and sweats out of the surface later, and the cold-throw you are trying to buy is the first thing that disappears.

So the correct move is the uncomfortable one: pour at the low end of the window, not the high end. For GB464 I work at 128–132°F and let the jar do the settling. Lower end buys glass adhesion; the top goes slightly less smooth, and a flat top is cheaper to fix than a wet edge ever is.

The instrument is the first leak

Before you argue about any of this, check how you are reading the temperature, because this is where most of the real loss happens. Infrared guns read the surface, and the surface of a wax melt runs cooler than the liquid in the middle. Clip-on thermometers on the pitcher wall read the same wrong number. The only reading that matters is a probe held in the middle of the liquid, where the wax you are about to pour actually is. If your number comes from the surface, you are already 5–10°F off, and the whole pour window is about a 10°F band, so you are pouring blind.

The fix is small and it is the one that pays back every time: a probe thermometer reading the centre of the melt, fragrance in at 185°F with a full two-minute stir so the oil actually goes into the wax rather than sitting on top of it, a controlled cool to the pour window before the jar, and a second pour for paraffin and coconut blends to fill the wick divot. Pre-warm the jar by a few degrees so the first contact does not shock the surface into setting early.

Pour temperature is the one variable you actually control, and it is the one that decides which blend you are really running. Get the wick wrong and the throw suffers; get the glass wrong and the burn suffers; get the pour wrong and every part of the candle you can see or smell starts wrong. If you have fixed the wick, the oil and the vessel and it still smells wrong, you do not have a wax problem — you have a wick problem, and that is a different job. But the crater, the pool and the dead smell in a fresh jar: start at the thermometer.