This video put out by fabricator Olive Mill, in California, shows the basics of how to route and sand a solid surface, cove countertop.
The video begins with a fully fabricated countertop with the cove insert and backsplash glued up for the purposes of time. The demonstrator uses a specialty Betterly Cove Router, and shows the cove routing itself, followed by the basic sanding process to complete a smooth, contoured cove radius.
Cove backsplashes are a great upsell in solid surface and can increase the value-add and the profits per job, making both the fabricator and customer happier.
You might also be interested in this video on granite chip and crack repair.