From online PDF file - also think there is an instruction sheet included..

Before you start, please make sure you have the proper safety equipment to avoid potential harm to you and your
vehicle.
1. Clean out the oil stain on the product. Using the clean duster cloth to wipe up the surface of the product with thinner. Then, use the duster cloth to wipe up the product again.
2. Sand the product in the water with No. 320 sand paper. Then, rinse it again.
3. Painting the product with the PU epoxy primer.
4. Mending the surface of the product after the primer’s drying (fill up the pinholes with polyester auto-body putty until the product looks smooth)
5. Painting the top coating of PU series.
You May Also Visit YouTube for Video Tutorial Demonstrations By Searching “Installing Body Kits”
C. Installation.
1. After the front lip spoiler is prepped and painted, double-sided tape should be applied to the indentation on the inside of the front spoiler. This surface has to be CLEAN and DRY for the tape to properly adhere. A residual-free cleaner is recommended (e.g. Wurth ™ Clean-Solve) to prepare the surface. The surface of the vehicle should also be prepped and cleaned for proper adhesion. For BEST
results after cleaning, use of an adhesion promoter such as 3M™ should be applied to wherever tape will be used. When applying tape, make sure that tape is smooth and wrinkle free. It is best to use multiple small pieces on long sections rather than 1 long piece.