French door windows coating

This product is a water-based, modified acrylic. You can brush it on or even use an airless sprayer. I covered several French door windows with this product, using an angled paint brush. I used my sprayer to apply the primer and paint, so I had to completely cover each of the windows for over-spray protection, but if you're painting with a brush, you only have to apply a narrow strip of liquid where the glass meets the wood.