Your sellers are entitled to everything they can get out of their home. Some say there is a fine line between salesmanship and deception. I disagree! Painting a room for appearance is salesmanship. Painting a room to cover up leaks is deception. The difference is clear! That is why i recommend to all my sellers to do three things:
First, disclose everything you can about the home, including defects you know exist and even ones you merely suspect.
Second, consider having a pre-listing inspection performed by a member of NACHI, the "National Association of Certified Home Inspectors" and this way one you have an early report, this way any issue is out and open and you the seller can fix the items without being rushed and you can save money by not rushing a repair man.
Third, many of buyer have happily paid full price after a Realtor has found them the right home, when honesty and salesmanship were started at the beginning of a transaction.
I have found out that honesty goes a long way to being successful and if you make your sellers understand this then both buyer and seller are winners in theses transactions.