I have a mowing business, now part time, but hope to retire from my "day" job in a year or two and then will mow more or less on a full time basis. Anyhow, I'm looking into getting licensed so I can spray herbicides, primarily in connection with mowing (driveways, sidewalks, etc.), and whether it is worth it with regards to the extra cost of licensing and insurance riders. I thought I might be able to offset these costs, at least, by doing some spraying on a small scale. For example, one guy I mow for has an RV park with a gravel parking lot and has to have the lot sprayed a couple of times a year. Now, for my question. How is pricing done when applying herbicides? Do you charge by the square foot? By the amount of solution you use? By the time required? And, how much is that pricing in your area? Thanks.