If your windows have developed holes there are a variety of ways to make them watertight again. First, determine the width of your hole. You must ensure that the hole is big enough to accommodate a large, thin object. This can be done with a coathanger. Then, use silicone to fill the hole and close it. If the ... than traditional double glazing, as the name suggests. Secondary glazing has many benefits that outweigh its drawbacks. This kind of glass is perfect for houses with old window frames....