Which of the following methods can be used when clamping both sides of a panel is not possible?

When clamping both sides of a panel is not possible, using adhesives is an effective alternative method for securing the panel. Adhesives, such as epoxies or structural bonding agents, create a strong bond between surfaces without the need for mechanical fasteners or external clamping pressure. This method allows for the distribution of stress across a larger surface area, which is particularly useful in situations where access is limited, and traditional clamping methods cannot be employed.

Adhesives also provide additional benefits, such as the ability to absorb vibrations and accommodate thermal expansion differences between bonded materials. They allow for a clean and visually appealing finish since there are no protruding fasteners. While other methods mentioned might be useful in certain scenarios, they typically involve mechanical fastening that requires access to both sides of the panel, which is not feasible in the situation described.