Which tool is best suited for accurately marking holes in composite materials?

The best choice for accurately marking holes in composite materials is a marker. Markers are specifically designed to provide sharp, clear lines that remain visible on various substrates, including composites. This high visibility is crucial when layout precision is required for drilling or cutting, ensuring that the marks can be easily seen and followed.

Markers typically have the advantage of a finer tip compared to other marking tools, which allows for more precise markings. Additionally, many markers are formulated with inks that adhere well to composite surfaces, preventing smudging or blurring that might occur with other tools like pencils or paints. This fidelity in marking helps ensure that the holes are placed accurately, which is essential in aerospace applications to maintain the integrity of the composite materials and ensure proper assembly.

The other options, such as pencils, paints, and Sharpies, either do not provide the same level of precision or may not adhere effectively to composite surfaces, making them less suitable for this specific application.