If you have double glazing seals that are failing, there are a few things you can do to try and fix the problem. First, check the sealant around the perimeter of the window. If it is cracked or peeling, you will need to remove it and apply new sealant. Be sure to follow the manufacturer's instructions for application and cure times. Next, check the weatherstripping around the edges of the window. If it is worn or damaged, you will need to replace it. Again, be sure to follow the manufacturer's instructions for installation and care. Finally, if your double glazing seals are still not sealing properly, you may need to replace the entire window. This is a more involved repair and you will need to consult with a professional to ensure the job is done correctly. If you are having problems with double glazing seals, it is best to call in a professional to assess the situation and make the necessary repairs. Trying to fix the problem yourself can often make things worse, so it is always best to leave it to the experts.