Acid stain a concrete floor by preparing the room, applying the stain, neutralizing the acid and applying a sealer. Every concrete slab reacts differently with the acid stain, so colors and patterns vary.
- Prepare the room
Empty the room, and clean the floor thoroughly before beginning the process. Remove any trim from where the floor meets the walls, and mask the walls.
- Apply the stain
Wear safety glasses to protect your eyes when working with acid stain. Mix the stain following the manufacturer's directions. Pour the mix in a clean garden sprayer, and test the spray pattern before applying the mix to concrete. Keep the spray wand about 18 inches off the floor, and use a random pattern. Make sure the entire floor is wet, but avoid creating puddles. Allow the stain to dry for about an hour, and apply a second coat. Continue applying coats until the floor reaches the desired color.
- Neutralize the acid
Clean the garden sprayer, and fill with a 20 percent solution of household ammonia in water. Spray this solution on the floor to neutralize the acid, and allow it to dry.
- Clean the floor
Clean any etching residue from the floor by mopping and vacuuming away any excess water. Allow the concrete to dry.
- Apply the sealer
Apply a concrete sealer designed for use with acid-stained concrete.