I am not a mason but I do numerous types of home repairs for real estate closings and have used products like this for patching previous work and also for coating dry stacked piers.

Lito - It just helps give you thicker skin.

And every other year seal-coating would cost about $250 instead of $100, so another $75/year beyond the norm.

If you are going to change to lighter colors that will require at least two coats.

One of the plaster/drywall/skim coat cracking or falling off above the shower tile.  

It about killed her(not diluted enough). then we put on a coat of poly, new pad, and new carpet. up goes the for sale sign.

Coat of fresh pain all around the exterior ?

Marc,15 month's isn't long enough to with-hold a deposit for a new paint coat in entirety, you'd lose that one (unless they smoked cigarettes or crack [seriously] and smoke damaged the property.You could only ensure victory by charging the painting (including prep) cost for the one wall.

-Note deferred maintenance (roofs, doors, springs, latches, seal coating, etc.)

They don't ride coat tails, they make the coat!