restoration
How to Restore Original Paint on a Classic Car
Learn professional techniques for recovering or replicating the original paint on your classic car. From surface preparation to final clear coat application.
7 min read
The original paint on a classic car is one of the factors that most influence its market value and authenticity. Restoring it correctly demands technical knowledge, the right products and, above all, patience. In this article we explain the full process as carried out at Gredos Garage.
Preserve or Repaint?
The first decision is whether the existing paint can be saved or whether a full respray is necessary. Original paint with light patina can be machine-polished and protected, preserving the vehicle's authenticity. However, if there are deep chips, oxidation or poor-quality previous resprays, it is best to start from scratch.
Surface Preparation
If repainting, the process begins with stripping. We use low-pressure media blasting or chemical stripper depending on the body type. Once the bare metal is exposed, we apply an anti-corrosion treatment based on phosphoric acid and seal with a high-adhesion epoxy primer.
Filling and Sanding
Imperfections are corrected with polyester filler and sanded progressively from 80 grit up to 600 grit. This process may be repeated several times until a perfectly smooth surface is achieved. Each layer is inspected under raking light to detect undulations invisible to the naked eye.
Identifying the Original Colour
Identifying the exact colour code is essential. We consult the vehicle data plate, manufacturer databases and, when necessary, perform spectrophotometric analysis on samples of original paint hidden beneath seals or mouldings. We hand-mix the colour until a perfect match is achieved.
Paint Application
We spray in a pressurised booth with controlled temperature and humidity. We apply:
- Two coats of high-build primer-surfacer
- Intermediate sanding with 400-800 grit
- Two to three coats of colour base
- Two coats of ceramic clear coat with UV protection
Polishing and Final Finish
After full curing (minimum 48 hours), we polish with diminishing abrasive compounds and finish with a ceramic sealant that protects the paint for years. The result is a finish with depth of gloss that faithfully respects the vehicle's original appearance. At Gredos Garage, we treat every paint job as a work of art.