Located in the Coma Cluster, about 300 million light years away from Earth, the orb is actually a distant view of the giant elliptical galaxy NGC 4889. At the center of that galaxy lies a sleeping giant: a supermassive black hole that is 21 billion times the mass of our sun. The size of a black hole can be estimated by its event horizon, or the distance from the center of the black hole at which nothing can escape its gravitational grasp.
Do not do this! Muriatic acid is used to profile concrete by breaking down the top coat of the surface for epoxy coatings and sealers. If used to remove oil stains you will still have oil underneath and a weakened concrete surface that will look different than the rest of the garage floor.
Most come with enough etching mixture and epoxy paint for one coat and a top coat. If you want to add a second coat, you will need to purchase additional paint and hardener. The kits and paint are available at any hardware store or online. Clean the concrete floor. The epoxy will not adhere to concrete covered with dirt and grease. Sweep up all dirt and debris, and mop the floor with a mixture of dish soap and water. Use a degreaser to scrub away grease stains with a stiff-bristle brush. You can purchase a degreaser at any hardware store.