My Cheap Soy Wax Causes Rough Tops That Need Heat-Gun Correction — How Do I Calculate the Labour Cost of Fixing Every Candle?

Time it, price it per candle, and compare it with the wax gap

The labour cost of fixing every candle is three numbers multiplied: minutes per corrected candle × your labour rate per minute × the share of candles that need it, plus a small electricity line. The minutes are the only hard part, and they are always more than the heat-gun pass itself: getting the gun out, handling each candle, inspecting it, letting it cool, re-inspecting, and going round again when the first pass leaves a ring or a crater. Time a whole session, not a single candle.

With an example time study — 10 minutes of setup across 40 candles, 0.5 minutes of handling and inspection, a 0.75-minute pass and 15% needing a second pass — each candle takes 1.61 minutes. At an example ₹150 an hour that is ₹4.03, and an example 2,000 W gun at an example ₹8.00 per kWh adds ₹0.23. Call it ₹4.26 per corrected candle. Replace every one of those figures with your own.

Now put it beside the wax. If your cheap wax were Natural Soy Pearl Wax at ₹424.80 a kilo and the candidate were Premium Coconut Soy Wax CSI 468 at ₹637.00 (5 kg rates), the dearer wax adds ₹39.04 of wax to a 200 g candle at 8%. At ₹150 an hour, the heat gun would have to take 15.6 minutes per candle before switching paid for itself on cost alone — and that assumes the dearer wax needed no correction at all, which only a test can show. In most workshops the honest answer is that heat-gun correction is cheaper than a much dearer wax per candle, and expensive in a different currency: capacity.

From minutes to rupees: the rework table

The lead table converts minutes per corrected candle into rupees at three example labour rates. Use the column nearest your own rate — whether that is a wage, a piece rate, or what your own hour is worth when you could be pouring or selling instead. The last column shows what the minutes add to a 100-candle batch at the middle rate.

Two minutes a candle sounds trivial, and at ₹150 an hour it is ₹5.00 — less than a single Eco Thin C1 wick. Across 100 candles it is ₹500.00 and more than three hours of someone's day. That is the real shape of rework: small per candle, large per month, and concentrated in exactly the weeks when you have least time to spare.

Running your own time study

Cheap wax plus heat gun against a dearer wax

Here is the full comparison with real CSI materials: a 200 g candle at 8% with Japanese Cherry Blossom Fragrance Oil at its 1 kg rate (₹4.84 a gram), Eco Thin C1 wick and White Matte jar. The cheaper candle is Natural Soy Pearl Wax at ₹232.34 in materials; the dearer one is Premium Coconut Soy Wax CSI 468 at ₹271.38. The example assumes the CSI 468 candles need no correction — an assumption to test, not a fact; CSI publishes no surface-finish data for any wax.

On these examples the cheap wax plus heat gun stays cheaper per candle even when every candle needs fixing — the ₹39.04 wax gap is large next to ₹4.26 of rework. The conclusion would flip only with much longer correction times, a much higher labour rate, or a high damage rate. If your current cheap wax is not Soy Pearl, or your candidate is closer in price, the margin shrinks: the ₹30-a-kilo comparison at 1,000 candles a month is the case where the wax gap is small and rework decides it.

The cost that does not show per candle: capacity

In an example 600-candle month, correcting every candle costs ₹2,556.75 — and 16.1 hours. During festive production those hours are the constraint, not the money. If the same hours could pour another batch, the true cost of rework is the margin on the candles you did not make. Whether easier pouring justifies a dearer wax and how cure time affects inventory follow the capacity thread.

Process first, wax second: the test

This test answers two questions at once: can a process change bring your current wax's rough-top rate down, and does the candidate wax do better than both? It needs more candles per arm than a burn test, because a rough-top rate is a frequency. Six candles per arm is a labelled working minimum; more is better. Everything else — oil lot, wick, jar, fill, room — stays fixed.

The priced test kit

24 candles in four arms of 6. In this priced version Natural Soy Pearl Wax stands in for your current cheap wax; if you already hold your own, the Soy Pearl line comes off. Wax: 3,312 g for the three current-wax arms (3,477.6 g with a 5% pour-loss allowance, a working assumption) and 1,104 g of CSI 468 (1,159.2 g). Oil: 384 g (403.2 g).

Candles that pass the surface standard in this test are saleable, so much of the kit returns to stock. A Pen Thermometer (₹354.00) is worth having if you do not already log pour temperatures — the process arms depend on it.

The decision rule, ending in a purchase

With the example result — warmed jars (arm B) halving corrections on the current wax and CSI 468 needing almost none — the purchase is still the current wax, Natural Soy Pearl Wax in 5 kg bags at ₹2,124.00, with the process change adopted. At the example rework of ₹4.26 a candle, CSI 468's ₹39.04 premium does not pay. If festive volume makes the remaining correction hours unaffordable, Premium Coconut Soy Wax CSI 468 in 5 kg bags (₹3,185.00) becomes a capacity purchase rather than a cost one — run its burn test first.

Rework is one of several costs that sit behind a cheap wax's price. The cost-per-saleable-candle hub sets out the whole formula; the rejects post covers candles you scrap rather than fix; the consistency ledger prices the extra candles you pour to be safe; the margin post asks whether fewer defects are worth more when you sell everything you make; and the true commercial cost of a soy wax puts them all on one sheet.

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