What should be used as a section point when working with an SMC panel?

Using panel reinforcements as a section point when working with a Sheet Molding Compound (SMC) panel is correct because these reinforcements are specifically designed to enhance the structural integrity of the panel. In SMC construction, reinforcements are typically located at areas where additional strength is required, such as around cutouts or along edges. They help ensure that the panel can withstand forces that could lead to cracking or failure during repair processes.

When selecting section points, it's crucial to choose areas that will not compromise the panel's integrity or the repair's effectiveness. Panel reinforcements are strategically positioned to provide the best support, making them the ideal choice for delineating section points.

The other options, while relevant in other contexts, do not serve this purpose as effectively. For instance, the space-frame may provide structural form but is not a designated section point. Mill and drill pads serve as locations for machining, not structural guidance. Horizontal bracing aids in overall stability but does not directly target the specific needs of SMC panel repairs. Thus, the use of panel reinforcements aligns with the objectives of ensuring a secure and effective repair process.