For many structural assembles, mechanical fasteners such as rivets and bolts offer an instant fix that joins pieces together. Structural adhesives take longer to join pieces, because they require curing time. However, even with that in mind, adhesives may be the more cost effective assembly solution in the long run. In terms of shear strength, structural adhesives are one of the strongest options available on the market. Unlike many other joining options, adhesives distribute stress across the full length of a joint, which contributes to their shear strength. Structural adhesives are a good option for lowering cost because assembly can often be automated and may be up to 20 times faster than welding. They can readily bond dissimilar substrates and heat-sensitive materials, as well as filling gaps and bonding irregular surfaces. There is also aesthetic value from using adhesives as well, since they are invisible within the seam of the joint and leave a smooth finished product.