Touch Up Car Paint Guide
BMW Portimao Blue C31: preserving a consistent metallic finish
Portimao Blue uses a metallic finish, so the apparent colour depends on more than the printed colour name. Confirm code C31 for the specific car and check for previous paintwork before beginning a visible local repair.
BMW Portimao Blue (C31) is best treated as a manufacturer formula rather than a colour you can judge reliably from a screen or a generic paint name. Small differences in finish, age and previous paintwork can make a visual match misleading.
Start with the code, then verify the car
The code C31 identifies the factory colour family used for Portimao Blue. It is still sensible to pair that code with the registration, model and year because manufacturers can revise formulas or use variants during production. If the panel has been repainted before, the existing finish may also differ slightly from the original factory specification.
| Item | What to use |
|---|---|
| Manufacturer | BMW |
| Colour | Portimao Blue |
| Reference code | C31 |
| Finish type | Metallic |
| Best first check | Vehicle paint lookup |
Choose the repair tool by the size of the damage
- Paint pen — useful for narrow chips, pin marks and fine scratches where control matters most.
- Brush bottle — better when a chip is wider or irregular and needs a little more paint laid into the damaged area.
- Colour-matched aerosol — suited to scuffs or larger local areas where a spray pattern will blend more naturally than a brush mark.
Repairing Portimao Blue without building a thick blob
- Wash the panel and remove wax, silicone and traffic film from the repair area.
- Inspect the chip. If bare metal or plastic is exposed, use the correct primer only where it is required.
- Apply colour in thin stages. A small repair normally looks better when the paint is built gradually instead of filled in one heavy coat.
- Allow the colour layer to flash and dry in line with the product instructions.
- If the paint system requires clear coat, apply it only after the colour has been laid down correctly.
- Leave the repair to harden before polishing. Trying to level soft paint usually makes the edge worse.
Assess Portimao Blue in changing light
A metallic blue repair may look different in shade, direct sun and at an angle because particle orientation affects its appearance. For an aerosol job, use even, controlled coats in accordance with the product instructions. For a chip, keep each deposit small and allow appropriate drying time rather than trying to level an oversized blob immediately.
Common causes of a visible repair
- Ordering from the colour name rather than confirming the code.
- Applying too much paint in one pass.
- Painting over polish, wax or silicone contamination.
- Trying to sand or polish the repair before it has fully hardened.
- Expecting a tiny local repair to behave exactly like a professionally refinished full panel.
BMW Portimao Blue FAQ
Is C31 the paint code for Portimao Blue?
It is a recognised reference for BMW Portimao Blue, but always verify it against the vehicle before ordering because production variants and previous repairs can affect matching.
Do I need lacquer over the colour?
That depends on the paint system and the product you are using. If the repair uses a basecoat system, a clear protective layer is normally required. See the application guide for the product sequence.
Can I repair a stone chip without spraying the whole panel?
Yes. Small isolated chips are exactly the type of damage touch-up products are intended for, provided corrosion or widespread clear-coat failure is not present.
Need paint for a small repair? Start with the Touch Up Car Paint vehicle lookup so the colour can be identified from the vehicle details before you choose a pen, bottle or aerosol.
