Failure to remove old sealer before applying a new coat can have serious consequences. First, the new sealer may not adhere properly, resulting in an uneven and blotchy appearance. Lack of uniformity and aesthetics can result.
Second, the old sealer may have worn down, exposing the pavers to stains, UV rays, and other elements. It could damage your pavers if left in place.
Without removing the old sealer before applying a new coat, cracks and damage beneath it will go unnoticed and untreated. This may cause further deterioration and costly repairs.
Therefore, before applying a new coat, you must properly remove any old sealer for the best results and long-term paver protection.