Shine Juice: Friction Polish for Woodturning with Shellac
Shine juice is a homemade friction polish for turned wood: equal parts by volume of 2-lb-cut shellac, denatured alcohol, and boiled linseed oil, shaken together and burnished on the lathe. Friction heat drives the mix into the surface, and the shellac builds a warm, glassy sheen in a few passes.
What you need
- 2-lb-cut shellac (2 lb of flakes per US gallon of alcohol). See what is a cut of shellac if the term is new.
- Denatured alcohol.
- Boiled linseed oil.
- A glass jar with a tight lid, a measuring cup, and lint free reasonably durable cloth to apply (a tough paper towel works too - something that won't get torn up by the piece).
Measure each liquid by volume. A 1-cup batch uses 1 cup of shellac, 1 cup of alcohol, and 1 cup of oil. Scale up the same way: three equal parts, any size.
How to make and apply it
- Pour the three measured parts into the jar in any order. Put the lid on tightly.
- Shake vigorously for a full minute. Shake before every use, because the oil and alcohol separate.
- Set the lathe to a moderate speed. My lathe doesn't have an RPM readout. I do "sanding speed". Fast enough to generate some friction heat but not too much.
- Fold a paper towel into a small pad and wet it with shine juice. The pad should be wet, not dripping.
- Spread the liquid around on a section of the piece without applying too much pressure. First just get it spread around. Just a few seconds.
- Hold the pad against the spinning wood with medium pressure and move it steadily along the piece. Keep it moving so the surface does not overheat in one spot, but go slow enough with enough pressure to heat.
- When the surface begins to glow, move on.
- Build the finish in several thin passes, letting each one set before the next. You can apply a lot of thin coats in one session, but stop and let it thoroughly dry every 5-10 coats.
How it differs from commercial friction polish
Commercial friction polishes are shellac-based formulas with their own solvents and additives. Shine juice is a blend you can read, adjust, and mix in a few minutes. The shellac is the film-former. The linseed oil keeps the pad gliding over the wood and gives a warmer, softer sheen than a plain shellac wipe. You control the cut and the oil ratio, and nothing in the mix is proprietary.
Limits you should know
- Keep it off food surfaces until the oil is fully cured. Boiled linseed oil takes time to harden. Weeks, not days to fully cure, after which it is quite stable.
- Denatured alcohol is flammable. Work with ventilation and keep flames and sparks away from the bench and the lathe.
- Use your prefered solvent. I use DNA as a standin, but it works fine with Everclear or your preferred shellac solvent.
- Dispose of oily rags correctly. Rags soaked in boiled linseed oil can heat as they dry and ignite. Spread them flat outdoors to dry completely, or store them in a sealed metal can with water until you can dispose of them.
FAQ
Why does my shine juice gum up or smear on the lathe?
Usually because your pad material isn't sliding smoothly across the surface. Try a linen cloth, waxed canvas, or tough paper towel. Use less, keep the pad moving, stop working once the solvent hads flashed off (don't overwork), and let each pass set before you add another.
Do I need to shake it before every use?
Yes. The oil and alcohol separate in the jar, and an unshaken mix gives uneven coverage and a streaky sheen.
Can I use shine juice on a bowl that will hold food?
Not until the boiled linseed oil has fully cured. Even then, treat it as a sheen, not a food-safe film, and confirm the finish suits the use before you rely on it.
Can I use button lac in shine juice?
Yes, and it's my favorite material. Shine juice is like French polish accelerated, so it makes sense the best shellac for French polish would work well with shine juice.
Mixing your own cut for shine juice? Shellac flakes are available at Shellac.net.