Advantages of pasting: firmness Disadvantages: it is too sticky, the window grilles are easily broken, and it looks a little dirty and difficult to clean.

Advantages of glue: firmness Disadvantages: too sticky, window grilles are easy to break and waste.

Advantages of double-sided adhesive tape: firm disadvantages: very troublesome.

Advantages of water: convenience Disadvantages: easy to fall off after air drying.

You can also use transparent crystal toothpaste, which is as transparent as jelly and as glue.

Dip a cotton swab into the crystal toothpaste and apply it gently, that is, apply the toothpaste slightly on the edge of a large piece of paper with a cotton swab, then gently stick it on the window with plastic paper when sticking it, and then gently smooth it on the plastic paper with your hands. This effect is better, flat and beautiful. And it is easy to clean in the future, so this method is recommended.