Lao friends spend a large portion of their non-work time with each other. They routinely drop over unexpectedly at any time of the day or night, yet this is not considered an infringement of privacy. The sharing of personal items and private business is expected and taken for granted, regardless of how valuable the items may be or how personal the business.
Lao people may sometimes test their relationship with you by making a request. For example they might request to borrow money or your car. The way to turn down a request is to refuse, but with an excuse, "Yes but today I need the car for a trip to Nong Khai. I will tell you later when you can borrow it." This is usually enough of a signal to indicate your point.