Chrome and brightwork trim
A plated layer that every polish makes thinner. Clean it gently once, then coat it so it needs polishing less often.
Precautions
- Ventilate the area
- Wear gloves
Start here
What this is, what tends to go wrong with it, and what to do about it.
Made from
What tends to go wrong
Hydrated iron oxide from corroding iron or steel. Distinguish a surface deposit, which cleans off, from active corrosion of the item itself, which does not.
Why it is difficult: Corrosion and passivation, Why old stains are harder, Adhesion and cohesion
- Tarnishvia its material
Unlike a stain, tarnish is made of the very surface it sits on. Removing it always removes metal.
Why it is difficult: Coating thickness
The science behind this: Polishing removes metal, Coating thickness
Part of Car exterior.
In detail
Brightwork is the plated metal on a vehicle: chrome bumpers, trim, badges and fittings, and on older vehicles nickel or brass. The clearest account of how to treat it comes from federal conservation guidance written for historic vehicles being stored or displayed. It is not a car maker's instruction for any particular model, and it should be read as conservation practice. The governing fact is that polishing removes metal. Every polish takes some plating away, and nickel plating in particular can be very thin and is probably already worn from earlier polishing. So the guidance is absolute about tools: never a buffing wheel or any powered abrasive method on brightwork. The procedure is clean, then coat. A mild polish first; then the polish residue cleaned off with acetone and mineral spirits; then, on chrome, a heavy coat of microcrystalline wax, warmed with a hot air gun so it flows into the corrosion pits, left to cool and buffed off with a cotton cloth. Brass and nickel take an acrylic lacquer instead of wax. The coat is the point: the metal is protected so the next polish can be put off as long as possible.
Why
- Chrome and brightwork trim is explained by Polishing removes metal
- Chrome and brightwork trim is explained by Coating thickness
Related
- Chrome and brightwork trim is made from Chrome plating
- Chrome and brightwork trim is made from Copper and brass
- Chrome and brightwork trim is commonly affected by Rust
Aftercare and prevention
- Metal polish requires the aftercare Chrome and brightwork trim
Polish once, gently and by hand, then coat it. A buffing wheel or any powered abrasive is ruled out entirely.
Sources for this page
Sources
Conserve O Gram 10/3: Preparing Historic Motorized Vehicles For Storage Or Exhibit
National Park Service, US Department of the Interior, 1999 · Government or regulator
Relied on for: That every polish removes metal, that nickel plating can be very thin and probably worn by earlier polishing, that buffing wheels and powered abrasives must never be used on brightwork, that polish residue is cleaned off with acetone and mineral spirits before coating, that chrome takes a microcrystalline wax warmed into corrosion pits and buffed off, and that brass and nickel take an acrylic. (states this directly)