Do you mean the F21 polish or the F21 Super Protectant for leather, vinyl, plastic, and rubber? If you mean the protectant, I use it on plastic and vinyl inside and outside of my two vehicles. It does an excellent job and lasts a long time. For example, my wife has an 03 Subaru Forster that has a hard plastic cladding around the bottom of the outside and covering both bumpers. It cleans it up very well, makes it look like new, and lasts for months.