These tutorials provide visual guides for repairing cracks in various vanity and countertop materials:

How I Fixed a Crack in my Bathroom Vanity: Stowsen Repair Kit YouTube · YoursTrulyYinka Crack Repair in a Corian Solid Surface Countertop YouTube · Andy Graves (Countertop Specialist)

Cracked countertop or tile? Here's how you can fix it yourself! YouTube · WKMG News 6 ClickOrlando