Epoxy Video
Most people are familiar with the epoxy in the two tubes and get mixed as you depress the plunger. The epoxy has two parts and the bonding is done through a chemical reaction when the resin and hardener are mixed.
There are epoxies designed for stone and brick. And they work underwater. The resin and hardener for these are thicker so they don't run. Each component is a different color to assist with the mixing. As you mix them, the color changes to a third color, indicating that they are properly mixed.
These paste epoxies have a long shelf life and hold great. One word of caution - when putting the lids back on the cans, be sure to get the proper lid on each can. If not, you'll never get the lids off.
Tim built custom homes and did ultra-custom remodeling for 20+ years before launching his Ask the Builder media presence. He was selected as one of the Big 50 by Remodeling magazine in 1993. This award gave birth to Ask the Builder in October 1993. Tim also operates https://DrawPlumbingPlans.com. His @askthebuilder YouTube channel was the first home improvement channel on YouTube.