The use of adhesives in the last decade has grown substantially in various industrial fields, particularly in the marine, aerospace and automotive sectors. The constant research for lightweight commonly leads the industries to choose composite materials for developing more efficient products, due to their good mechanical properties and very low weight per unit of volume. Although composite materials present many advantages, they cannot be joined with traditional techniques, such as bolted joints, which involve drilled holes that are harmful to these materials, then adhesive joints are preferred. The adoption of adhesive joints leads also to a more uniform stress condition along the joint, moreover can prevent the corrosion of substrates with their sealant properties.