If a customer asks for 50% I give it to them if they don't I wont send it to them.........I find that more and more are asking for a deposit, even the companies that install on a regular basis for me.....I think it is always a smart move to ask for it then your front end is covered! I agree with the last comment......do great work when installing and I will always pay promptly. The problem is it is hard to find those "great" sign companies! Always looking though!