Dewaxed vs Waxed Shellac for Wood Finishing
The wax question decides more about your result than the colour grade does. What the wax does, when it will ruin a job, and the four things to specify when buying flakes in bulk.
If you finish wood, the wax question decides more about your result than the colour grade does — and it is the one most suppliers explain worst.
Here is what the wax actually does, when it helps, when it will ruin a job, and what to specify when buying in bulk.
Where the wax comes from
Lac wax is not an additive. The insect secretes it along with the resin, and it is naturally present in shellac at a few per cent unless it has been deliberately removed. How much survives depends entirely on how the seedlac was processed.
Heat-and-press methods — the traditional bhatta route and its mechanised equivalents — squeeze molten resin through cloth and leave much of the wax behind, but not all of it. That gives waxed shellac: shellac flakes and button lac as normally traded.
Removing the wax properly requires dissolving the seedlac in ethanol and filtering or centrifuging the wax out. That gives dewaxed shellac. It is a different process, not a longer version of the same one, and our production guide covers both routes.
The distinction people get wrong
Wax content and physical form are independent attributes. Dewaxed is not a shape; flakes are not a composition. You can buy waxed flakes and dewaxed flakes. Asking a supplier for "dewaxed flakes" is a perfectly sensible order; assuming that flakes are dewaxed because they are flakes is how the wrong material ends up in a workshop.
The same holds for colour. Blonde, lemon, orange and garnet describe how dark the resin is — a function of crop and host tree. Colour tells you nothing about wax content, and vice versa.
What the wax does to a finish
| Clarity | Wax scatters light. Waxed shellac gives a slightly cloudy, softer-looking film; dewaxed dries noticeably clearer and shows more grain depth. |
| Sheen | Waxed produces a warmer, more muted lustre that many finishers prefer on its own. Dewaxed builds to a higher, glassier gloss. |
| Intercoat adhesion | The decisive one. Wax interferes with the adhesion of finishes applied over the top. |
| Water resistance | Marginally better with wax present, though neither form is a water-resistant finish in any serious sense. |
The adhesion problem
This is the reason dewaxed shellac exists as a distinct commercial grade. Shellac is widely used as a sealer and barrier coat — it blocks tannin bleed and stains, sticks to almost anything, and accepts almost anything over it.
Almost. Wax on the surface compromises adhesion of subsequent coats, and polyurethane in particular can fail to bond, peeling or lifting later. Dewaxed shellac is what makes shellac a universal sealer. If any other finish is going over the top, the shellac underneath should be dewaxed.
Where shellac is the entire finish — french polishing, traditional furniture work, a padded shellac finish left as-is — waxed material is perfectly good, and many finishers prefer its warmth.
Choosing
- Sealer or barrier coat under another finish → dewaxed, without exception.
- Shellac as the complete finish → either. Waxed for warmth, dewaxed for clarity and depth.
- French polishing → either; dewaxed if maximum clarity matters on a pale wood.
- Instrument work → usually dewaxed, for clarity and for predictable behaviour under later coats or repairs.
- Over an oil-based stain, under polyurethane → dewaxed.
Buying in bulk
Flakes rather than pre-mixed solution, for one straightforward reason: dissolved shellac has a short working life. Once in alcohol it begins to esterify, and old solution dries slowly or stays tacky. Dry flakes stored cool and dry keep far longer. Mix what you will use.
Specify four things and you will get what you expect:
- Wax status — waxed or dewaxed. Do not leave it implied.
- Colour grade — and ideally the crop behind it, since Kusmi runs paler than Baisakhi.
- Form — flakes or button.
- Batch certificate — with wax content and insolubles measured, not just quoted as a range. Our documentation guide explains the difference.
Store the flakes cool and dry, and rotate stock. Shellac ages whether or not you use it, and warm storage accelerates it — the mechanism is the same one behind blocking.
How we supply it
Waxed shellac flakes and button lac are produced at our own facility at Nawada from seedlac sourced in the Jharkhand lac belt. Dewaxed and bleached grades are solvent-processed, which requires a dedicated ethanol-handling plant we do not operate; those grades are produced for us by established specialist processors, tested to the same standard and shipped under our documentation.
We would rather state that plainly than imply a capability we do not have on site. What we do control either way is the seedlac going in, the testing, and the paperwork coming out.
Buying Shellac Flakes in Bulk?
Waxed flakes and button lac from our own facility; dewaxed and bleached grades through our processing partners. Batch certificate with wax content measured on every shipment.