We recently had a friend visit us who stood awkwardly on one of our slate steps leading to our front door. The slate must have been very brittle and large chunk came away. Not really sure what to do, I popped down to our local hardware store and spoke to our go-to guy there who recommended an extremely strong adhesive for this repair. I made a video of this, and really chuffed with the way it turned out. Not sure how well the adhesive is going to hold and whether it'll break again if someone stands on it. If it does, does anyone have any other suggestions how one could repair a broken slate step?