This video shows the viewer how to correctly use acid stain to stain a floor. In the video the acid stain is applied to a floor using in a spray. This is done using a device similar to one used to apply weed killer to plants; another suggestion would be with a watering can that has an adjustable nozzle. Basically the acid stain can be applied with any device that can be used to apply the acid in a thin and even layer. This stops the acid from staining the floor in an uneven manner and helps to create a consistent overall effect. For more information and a real life demonstration of how the acid stain is applied please watch the video.