Preparing the surface and protecting areas not meant to be painted are the actions that most directly influence how well the paint will behave once mixed and applied. Wiping the prepared area with acetone removes oils, grease, waxes, and other contaminants that can prevent adhesion or cause defects like fish-eyes. Acetone also evaporates quickly, leaving a clean surface without residue that could interfere with the coating. Masking any stencil areas ensures those patterns stay sharp and protected from overspray, so you don’t have to spend extra time cleaning up edges after painting. Other options relate to steps that occur either during equipment setup or during the actual mixing and painting process. Checking the spray gun and nozzle is important for application quality, but it’s not the surface prep step. Opening and stirring the paint pertains to mixing the paint itself, not prepping the surface. Ventilating the room is a safety practice during painting, but five minutes may be insufficient and it’s not the specific preparatory action targeted by this question.

Policy and responsibilities for a program like CPAC are set in an official Marine Corps Order. Such an order provides the authoritative governance, assigns roles, and establishes requirements that apply across commands, ensuring consistent implementation of the CPAC program. Technical manuals, on the other hand, focus on how to perform tasks or maintain equipment and do not establish who is responsible or what policy applies. Therefore, the document that best describes CPAC program policy and responsibilities is the Marine Corps Order.

Policy letters set mandatory training and program requirements, and CPAC stands for Corrosion Prevention and Control. Policy Letter 1-09 is the one that outlines CPAC training requirements—the specifics of what training is needed, who must complete it, and how often it should be done. Because the question asks which requirement is covered by this policy letter, the option that describes CPAC training requirements is the best match. The other policy letters point to different topics, so they don’t align with what 1-09 covers.

Pitting factor measures how severe a pitting corrosion attack is by comparing the deepest pit to the overall material loss. It’s defined as the depth of the deepest pit divided by the average metal loss over the exposed surface. When corrosion is uniform, the deepest pit isn’t much deeper than the average loss, so the factor is about 1.0. If one pit becomes much deeper than the rest, the deepest pit depth grows relative to the average loss, and the factor increases. This directly quantifies how localized the damage is, which is why the ratio of deepest pit depth to average metal loss is the best way to describe pitting severity.