To install your 3D waterproof stair mural, first cut it into pieces according to your staircase size. Then tape the four corners of the template on the stairs. Peel the adhesive film off the back and stick it on the stairs. Finally, peel off the front paper layers. Remember, the default price online is for the 82*305cm size. Also, don't let water touch the black gum. And keep in mind that there may be a small color difference between what you see on the screen and the actual mural because of monitor settings. To maintain it, just keep it dry and clean it gently with a soft cloth if needed.