Need some help
So, Im fixing my fiance's escort, Im sanding and painting a new bumper and back up light filler panel. This is the first time ive painted with air compressor and paint gun. I went to my local wesco and got the paint and clear coat. they also gave me top coat hardener and reducer. to dumb it down a bit as i feel... wassat all that stuff for? o_O is there mixing involved somewhere? can anyone help with what im suppose to do with the top coat and reducer?