I agree with the other guys. I allow my folks to use my place for their own stuff. Never for profit. I think it sends the message to the customer that it was so small you didn't want to mess with it. I don't ever want one of my customers to feel that way. Like with anything else, there is always going to be that one that you give an inch and they take 10 miles and abuse it. If ever one of mine abused it, it would stop for all. I am kind to a point, but don't take advantage of my kindness. Sounds like you already know what you need to do. Probably going to be hard to do it, but you can't let employees, no matter how great, to take advantage of you. Especially while using your place, your equipment and your materials! Not cool.