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Shellac for musical instruments: origin, varieties and application
Introduction
When a luthier wants to enhance the beauty of wood without compromising its natural resonance, shellac is the finish of choice. This old-school finish gives a super-thin coat that lets the instrument breathe and leaves a smooth, warm glow.
Where it comes from and how it’s made
It all starts in the forests of northern India and Southeast Asia, where the Kerria lacca bug coats tree branches in a resin. Once harvested, this stick-lac is crushed, washed, melted, and filtered through cotton cloth. The result? Thin sheets that dry and break into flakes or grains. The better it’s filtered, the less wax it has — so you get colors ranging from rich amber to almost-clear platinum.
What you'll find at Maderas Barber
Our store offers a full range of shellac, from our rawest form to ready-to-use solutions:
- Stick and seed lac crude shellac: unprocessed resin for those who like to start from scratch. Needs long decanting to remove wax and debris.
- Astra Shellac: medium-filtered amber flakes that give a classic shine to Spanish and flamenco guitars.
- Goma Laca Limón 1 (Lemon 1): light golden tone, keeps spruce tops bright.
- Dewaxed Shellac Superblonde: nearly colorless (<0.2% wax), perfect for violins and light woods where maximum clarity is desired.
- Wax-free Ruby Shellac : a deep ruby tone that enhances the richness of rosewoods, ebonies, and other dark woods.
- Wax-free Very Light Shellac: an extremely clear alternative to Superblonde, with a slightly warmer touch.
- Wax-free Shellac: a balanced option in color, clarity, and hardness, compatible with alcohol-soluble dyes.
- Shellac Sanding Sealer (solución) y Dewaxed Shellac Ready‑To‑Use Nitorlack®: pre-diluted formulas ideal for sealing or quick touch-ups without waiting for flakes to dissolve.
Each variety shares the lightweight feel and polishability of shellac but differs in tone, clarity, drying time, and sanding ease. The right choice depends on the wood’s color and the desired finish.
How to mix it
For flakes or grains, the standard ratio is 200 g per liter of 96º ethanol (known as 2 lb-cut). Place the flakes in an amber glass jar, add the alcohol, shake gently, and let it rest overnight. Mild warmth helps speed up dissolution without damaging the resin. Before use, filter the solution through a nylon stocking or fine coffee filter to remove suspended wax and ensure a clean, homogeneous mixture.
How to apply it
French polishing
Start with a very diluted sealer coat mixed with pumice to level the pores. Once dry, prepare the pad — a small cotton wad wrapped in cloth — and load it with standard shellac solution. Apply with wide circular movements and minimal pressure, letting the alcohol evaporate between passes. When a glossy surface starts to show with slight streaks, switch to spiriting: use a thinner solution and long passes to smooth the finish. A few drops of mineral oil improve glide and prevent dragging. For the final polish, use a lighter solution and almost no pressure to achieve a deep, even gloss.
Brush or spray
If you're working on flat electric bodies, thin it to a milk-like consistency. Use a 1.2 mm nozzle at low pressure and apply thin coats, waiting 15 minutes between them and lightly sanding with P800 grit to avoid raising the grain.
Touch-ups and repairs
Shellac can be re-softened with its own solvent, allowing new coats to fuse seamlessly with the old ones — one of the few truly repairable finishes.
Good to know
Work in a warm environment (18–25 °C) with humidity below 60% to avoid cloudiness. Store the solution in a well-sealed, light-protected jar. The clearer the shellac, the more sensitive it is to oxidation — so prepare only small amounts to be used within a couple of months. To enhance dark grain, add alcohol-soluble dyes: the resin will act as a carrier and seal the stain into the wood.
Why choose shellac
Besides being the finish that least affects sound, shellac is biodegradable, adheres to almost any wood, and gives a deep gloss in just a few microns of thickness. Its thermoplastic nature allows for easy maintenance and local repairs, while its warm aesthetic enhances both light tops and dark backs. That’s why it remains the benchmark finish in workshops for classical and flamenco guitars and violins.
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Find your ideal shellac at Maderas Barber
Visit our online store to find the shellac that best suits your project. Add fine sandpaper, oils, or dyes to your order and share your work with other luthiers!
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Ruby dewaxed shellac is a solid natural resin of animal origin, obtained from the secretion of the Kerria lacca insect. It comes in the form of deep dark red flakes, resulting from a purification process that removes natural waxes.
Highly valued in lutherie for its ability to provide a deep, warm, and glossy finish, enhancing...
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Extra pale dewaxed shellac is a solid natural resin of animal origin, obtained from the secretion of the Kerria lacca insect. It comes in the form of very pale yellow flakes, resulting from a bleaching and dewaxing process.
Due to its high purity and transparency, it is especially suitable for preparing fine varnishes...
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Lemon 1 shellac flakes are a solid natural resin of animal origin, obtained from the secretion of the Kerria lacca insect. They come in the form of dark amber-colored flakes and contain natural wax.
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Widely used in the preparation of varnishes for musical instruments, especially in the lutherie of bowed string...
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Seed lac is a solid natural resin of animal origin, obtained from the secretion of the Kerria lacca insect. This form of shellac has been partially purified, removing some impurities present in stick lac, and is presented in small granules ranging from amber to brown in color.
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Shellac sealer is the traditional way to seal wood before applying a polish or wax.This product has a high percentage of real shellac, which means it does its job very well, dissolved in an ethanol solution for ease of application and quick drying.It can be applied with a cloth, brush or sprayer and dries in...
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