[Rick Parker]

Different expansion rates will cause issues between the aluminum and fiberglass. Best solution is to use a flexible Structural adhesive such as something made by Lord or 3M. They are 2 part, often able to be used with a caluking type gun or similar on a smaller scale. Working time can be up to an hour or as little as 5 minutes. Find it a a Paint & Body Shop supply shop. This is how they bond the various parts of a Corvette together. Finished product is generally stronger than the parent material.