Carbon Fiber Parts: Form, Function, and Maintenance

Carbon fiber reinforced polymer (CFRP) is a composite material prized in motorsport and aerospace for its incredible strength-to-weight ratio. It consists of microscopic carbon crystals woven together into a fabric, which is then bound by a rigid polymer matrix, typically an epoxy resin.

It is significantly lighter than steel and aluminum while offering excellent rigidity. In the tuning world, swapping heavy steel body panels (like hoods, roofs, and trunks) for carbon fiber equivalents dramatically reduces the vehicle's weight and lowers its center of gravity, improving handling and acceleration.

Not all carbon fiber is created equal. The two main manufacturing methods yield very different results: wet carbon and dry carbon.

Wet carbon is made by hand-laying carbon fiber sheets into a mold and manually coating them in liquid resin. The resin cures at room temperature or low heat. While this process is more affordable and produces a highly glossy finish, the excess resin adds unnecessary weight, and the hand-laid weave can sometimes be misaligned.

Dry carbon uses pre-impregnated (pre-preg) carbon sheets that already contain the exact amount of resin needed. These sheets are laid into a mold and baked in a vacuum-sealed autoclave under high pressure and heat. This process squeezes out air pockets and excess resin. Dry carbon is much lighter, vastly stronger, and significantly more expensive. It is often finished with a matte or satin look, though it can be clear-coated for gloss.

Beyond weight savings, carbon fiber is commonly used to construct rigid aerodynamic components like front splitters, rear diffusers, side skirts, and prominent rear wings.

Because carbon fiber is exceptionally stiff, these components will not flex or warp under the immense air pressure generated at high speeds. A flexing plastic splitter can disrupt airflow and cause a loss of downforce, whereas a carbon fiber splitter maintains its shape and aerodynamic efficiency under load.

The beautiful woven pattern of carbon fiber is actually protected by the epoxy resin and, typically, an automotive-grade clear coat. Unfortunately, many aftermarket wet carbon parts are finished with cheap gel coats that offer poor UV protection.

When exposed to direct sunlight over time, UV rays break down the resin, causing the carbon fiber part to turn cloudy, yellow, or even begin peeling and flaking. To prevent this, it is absolutely crucial to protect your carbon fiber components.

Treat exterior carbon fiber exactly like your car's paint. Wash it regularly, and keep it protected with a high-quality UV-blocking carnauba wax, a synthetic paint sealant, or best of all, a ceramic coating. If the clear coat begins to oxidize, it can often be wet-sanded and polished back to a high gloss, just like normal paint.