The strength of a handmade sandwich panel, or any sandwich panel for that matter, depends on several factors, including the choice of materials, the design, and the intended application. While some sandwich panels can be strong enough to meet specific requirements on their own, others may require additional reinforcement or support to achieve the desired strength. Here are some considerations:

1. Core Material: The core material plays a significant role in determining the strength of the sandwich panel. Some core materials, such as plywood or certain types of foam, provide inherent structural strength, making the panel strong enough for certain applications without additional reinforcement.

2. Facing Materials: The facing materials also impact the strength of the panel. Materials like fiberglass, steel, or aluminum facings add rigidity and durability to the panel, contributing to its overall strength.

3. Design and Thickness: The design of the sandwich panel, including the thickness of the core and facing materials, affects its strength. Thicker panels generally have higher load-bearing capacity. Design factors such as the spacing and arrangement of fasteners or bonding agents can also influence strength.

4. Load-Bearing Requirements: Consider the specific load-bearing requirements of your project. For applications where the handmade sandwich panel will be subjected to significant loads, additional reinforcement may be necessary.

5. Reinforcement: In some cases, especially for structural or load-bearing applications, sandwich panels may be reinforced with materials like steel or carbon fiber, or they may be combined with other structural elements to enhance strength.

6. Support and Framing: The support structure and framing used in the installation of the sandwich panel can significantly impact its overall strength. Adequate support and attachment methods are essential to ensure the panel's strength is effectively utilized.

7. Engineering Evaluation: It's advisable to conduct engineering evaluations or structural calculations when designing and using sandwich panels for critical applications. This helps determine whether the panels meet the required strength and safety standards.