Furniture polish feeds the wood

Does it work?

Does not work

Refuted as stated. The nourishment framing has no mechanism behind it on a finished piece, and the conservation guidance establishes an active harm rather than merely an absence of benefit. It is a separate matter from conditioning an oil finish, which is a real practice on a different kind of surface.

This is a verdict on whether the technique is effective. Whether it is safe on a particular surface is a separate question, answered below.

Where not to use it

The proposed mechanism

The explanation below is what is offered for this technique. No evidence establishes that this is what actually happens, so treat it as a plausible story rather than as a finding.

The proposed mechanism is that wood dries out and a polish replaces lost oils. Both halves are shaky. Timber gains and loses moisture with ambient humidity rather than losing oils, and a surface film cannot pass through a finish to reach the substrate anyway. Where the piece is genuinely unfinished or oil-finished, an appropriate oil does replenish the finish itself — which is conditioning of a coating, not feeding a material, and it is a different practice with a different product.

Background

Two things are wrong with this and the second is more serious than the first. The first is straightforward: a finished piece of furniture has a barrier between the polish and the timber — a lacquer, a varnish, a shellac or a cured oil — and a product applied to the outside of a sealed surface does not reach the wood at all. What it does is sit on the finish, adding gloss and, over time, building a film that attracts dust and can go cloudy. Timber's dimensional stability is governed by the humidity of the room rather than by anything applied to its surface. The second problem is what the polish leaves. Federal conservation guidance states that most commercial furniture polishes contain silicone, that it is difficult to remove once applied, and — the sentence that matters — that a residue can be present even when the finish is stripped to bare wood. It has migrated into the timber, and it only becomes apparent when a new finish is applied and produces the crater-like defects called fish eyes. So the practice does reach the wood after all, in the one way nobody intended. For most furniture, dusting is the maintenance and polishing is optional.

Conditions

• Applies to finished furniture
• Different considerations apply to bare or oil-finished timber

What it does not do

• On a finished piece nothing applied to the surface reaches the timber.
• Build-up attracts dust and can cloud the finish it was meant to improve.
• Most commercial products contain silicone, whose residue survives stripping the finish.

What to use instead

• Dusting — The lowest-status task in cleaning and the one that prevents the most damage — because what is being removed is abrasive, hygroscopic and edible.
• Waxed wood — The traditional finish, and the one most damaged by modern cleaning habits: water marks it, heat softens it, and detergent removes it.
• Conditioning — Replacing what cleaning and age removed. The leather trade fences it far more tightly than the market does, and its frequency is measured in months.
• Wooden furniture — The finish decides everything, and the most-used product on it leaves a residue that survives stripping the finish down to bare wood.