I'm getting ready to begin shipping brick to the largest project I've sold to and concerned the subcontractor mason who I'll be selling these to is going to be a problem for a myriad of reasons. It was suggested to me I file to owner in advance to protect myself if the mason doesn't pay in terms or holds back payment. If this protects me, please advise how and what steps I should take to file. We're a few weeks from shipping first load and I want to protect myself as much as possible.