Chrome, Brightwork and Trim for Classic Restoration

Decorative chrome on steel is conventionally a triple plate. Copper goes down first and does the levelling: it is soft and polishes easily, so it fills the fine scratches the base metal carries, and the hand work in a good job happens between the plating steps rather than at the end. Nickel does the protective work and supplies most of the brightness; chromium goes on last as a thin, hard, tarnish-resistant film. ASTM B456, which covers electrodeposited copper-nickel-chromium and nickel-chromium coatings, grades them by service condition from mild through extended very severe — and what mostly changes between grades is the nickel, not the chromium.

That matters because cheap plating cuts in predictable places: less substrate preparation, thinner nickel, fewer polishing passes between layers. A part with too little nickel looks identical under showroom light, then fails at edges, corners and mounting holes where the deposit is thinnest. An order that says only "triple chrome plated" has specified nothing.

Two chromium processes are in commercial use and they do not look identical. Hexavalent chromium, the traditional decorative process, deposits a film with a faintly blue cast. Trivalent chromium — the lower-toxicity route now widely used — read measurably darker and warmer in its early forms, a gap modern colour-adjusted processes have narrowed but not erased. On a car with one reproduction bumper and one re-plated original, that is what an owner notices in daylight.

Zinc die castings — pot metal — carry the grilles, handles, escutcheons and badge bases on most post-war American classics, and they are porous. That porosity holds plating solution by capillary action; if the casting is not sealed and prepared properly, the trapped electrolyte corrodes under the deposit and lifts it. Older castings compound this: lead and tin at grain boundaries drive intergranular corrosion that swells and cracks a part from within, and a swollen casting cannot simply be re-plated.

Stainless brightwork is a different trade. Window reveals, drip rails and side spears are polished stainless, not plated — there is no shell to fail, so damage is worked out of the metal itself and re-polished. Anodised aluminium mouldings are a third case: the bright layer is an anodic oxide film, so sanding out a scratch removes the finish and the part must be stripped, polished and re-anodised.

These are trade terms, not standards, and no two shops draw the line in the same place. What varies is hand work: how far the substrate is straightened, whether pitting is ground out or plated over, how many sanding passes the copper gets, and how much attention faces that never show receive. Writing "show quality" on a purchase order is a wish. Write these instead.

A sample is worth more here than in almost any other reproduction category, provided you look past whether it is shiny.

Frequently — worth saying plainly, because we would rather sell you sourcing. If your original is straight, uncracked and the base material sound, re-plating it usually beats any reproduction: the geometry is genuinely original, there is no tooling shrinkage, no pattern taken from somebody else's worn part, and the holes are where the factory put them. Reproduction earns its place when the original is missing, swollen, cracked beyond repair, or when you need forty.

Some trim nobody reproduces at all — long stainless spears with compound curves, one-year-only mouldings, anything whose tooling cost cannot be recovered across the surviving cars. Those get repaired, and the used market plus a good stainless shop is your supply chain. If your project is a single car, you do not need an importer at all.

Sourcing earns its keep in the repeat case — a reproduction brand, a specialist stocking a platform, an e-tailer needing the same piece repeatedly with a physical reference to work from. If that is you, describe the part in plain English on our request page: vehicle, years, position, material, and what you have in hand. Taiwan Supplier Hub returns a shortlist of at least three verified manufacturers that have confirmed they want the project within 14 days, US$99 at launch, refunded if we can't deliver.