Just completed an exterior job, the customer had sandtex mixed into a very dark green colour. The finished job looked lovely, customer very happy but then a few days later there is surfactant leaching on one side of the property and it looks awful. Only once before have I come across this in 36 years of being in the trade, from memory it usually corrects itself in time and weathers off so to speak but trying to reassure the customer of this has been tough. Any thoughts fellas ?.