Faded paint can often be polished back, as long as there's enough sound paint left to work with. Compounding cuts away the dead, chalky surface and polishing brings the gloss up from the paint underneath. When the colour has worn too thin, or the clear coat over it has started to fail, polishing can't put it back, and the panel needs paint.
Here's how to tell which side of that line your car is on.
Why does car paint fade?
Sunlight and weather break down the top of the paint. PPG, one of the big paint makers, calls the result chalking, and among its causes lists degradation of the binding agent and degradation of pigment. The binder is the resin that holds the paint together and gives it its shine. The pigment is the colour.
Look at the roof, the bonnet and the top of the boot lid first. They face the sky and take the most sun.
What does chalky, faded paint look like?
Dull and flat, with no clear reflection, and often lighter than the colour should be. PPG describes chalking as a chalky dusting or powdering at the paint surface, often associated with old, weathered paint film.
On single stage paint, where the colour and the gloss are one layer, rub a faded panel with a little polish on a clean white cloth and the cloth comes away coloured. That's the top of the paint coming off.
Can faded paint be polished back?
Often, yes. PPG's remedy for chalking is to flat, compound and polish the surface to restore the gloss, and to repaint the top coat in severe cases. Its advice on a dull finish is the same: compound and polish, and where the dulling is too severe for that, rub down the top coat and repaint.
Compound is a paste with a fine abrasive in it. It cuts a thin layer off the surface, taking the faded paint with it, then a finer polish brings the gloss up. Where the surface is rough, it's flatted first, wet sanded with very fine paper.
That's the catch: every step takes paint off, so polishing only works while there's enough left.
Why start with a test patch?
Because nobody can tell how a faded panel will come back until a bit of it has been done. A small area is compounded and polished, then looked at in daylight. It shows whether the colour comes back even, how much cutting it takes, and whether the paint under the fade is sound.
A patch tells you about that panel. Paint that sits in the sun fades more than paint that doesn't, so the roof can need far more work than the doors.
How do you know when there isn't enough paint left?
A paint depth gauge reads how thick the paint is, so you know what there is to work with before any comes off. The edges and the tops of swage lines, the creases pressed into a panel, are where paint is thinnest and where a polish goes through first.
The signs it has gone too far are plain to see. The colour turns patchy after polishing, primer or an older colour shows on the edges, or the gloss won't come up at all. At that point the colour has gone too thin to save.
What if the clear coat is the problem?
On a car painted in basecoat and clear, the colour sits under a clear lacquer. If that clear is sound and only dull, it polishes like any other gloss. If it has gone cloudy or milky, or started to lift, a polish has nothing to work on, and the panel needs painting. Peeling lacquer has its own guide.
When does faded paint need a respray?
When polishing can't bring it back evenly, or when there are more tired panels than good ones. If the roof, bonnet and boot lid have gone too thin and the sides are dull too, painting them one at a time leaves a patchwork. A respray puts the whole car back to one finish.
If the whole car is being painted anyway, it's also the moment to think about a new colour. See custom paint.
Will one repainted panel match the faded ones?
It can be made to. New paint mixed to the paint code can read a shade off beside paint that has faded, so it's blended into the panels either side, and the eye never meets an edge. PPG's basecoat blending procedure allows at least 12 inches, about 30cm, of blend into the panels next to the repair for an ordinary basecoat.
If the panels either side are being polished, do that before the colour is matched, so the match is made to the colour they end up.
How do you stop paint fading again?
Keep it out of strong sun where you can, and wash it gently. PPG's prevention for chalking is to use the recommended materials and to avoid exposure to ultraviolet light, meaning strong sunlight, and harsh shampoos. A garage or a car cover keeps the sun off a car that stands for long spells.
On basecoat and clear, the clear is what shields the colour. Axalta, another of the big paint makers, says its clearcoats help protect finishes against UV exposure and environmental weathering.
What moves the cost?
Whether polishing brings it back or it needs paint, how many panels are faded, how far each has to be taken, and whether it ends in a full respray. See prices for how we quote.
Faded paint? Send us a close-up of the worst panel, a photo of the whole car and the paint code if you have it, from the quote form.
