Black Wow will last you for awhile. I been booked solid for months now and am still on the same bottle. Now, most of my clients car's don't need it, but I still use it often. If for instance the trim on a bumper isn't terribly oxidized or horrid, a pea size drop will do the whole bumper. I really love Hyperdressing for trim, because you can actually dilute it to suit your needs(e.g. shine or matte) and when buffed in with a towel correctly you should be able to run your hand over it and it will be dry and clean, not greasy and messy. Hyperdressing is my go to product and then I have BW on standby for older trim work that needs to look new again.