In truth, there is no one definitive answer to this question, because each case is different. Generally, professionals recommend repainting every 3 or 4 years, although there are a multitude of variables that can determine that new paint is needed sooner. While it is true, if it has been applied correctly, the paint is of 1st quality and adequate maintenance is carried out, we can lengthen the time without painting up to 5 or 6 years.