This product is a lace glue that is used to attach lace to the hairline. It is made of water, acrylates copolymer, propylene glycol hydroxyethylcellulose, fragrance, and sodium dehydroacetate. The acrylates copolymer helps to create a strong bond between the lace and the hairline, while the propylene glycol hydroxyethylcellulose helps to keep the glue in place and prevent it from drying out. The fragrance is added to provide a pleasant scent to the product.
To use the product, it is important to shake it well before use. A patch test should be done on the skin for any irritations. 
The first step is to remove all residues and dirt from the hairline. 
The second step is to apply 2 to 4 thin layers of lace glue above the hairline. 
The third step is to wait until the lace glue turns clear and tacky. 
The fourth step is to apply the lace onto the tacky substance that was created above the hairline. 
The fifth step is to allow the lace glue to dry and tie down for 10 minutes.
It is important to note that the product should be used at personal discretion. The ingredients should be read and a patch test should be done before proceeding further. Body chemistry varies amongst persons, and the company is not held responsible for any allergic reactions.
Overall, this lace glue is a reliable product that can be used to attach lace to the hairline. It is important to follow the instructions carefully to avoid any irritations or allergic reactions.