2. Glue the patches

■ Lay on the ground the fly and the door panel. Make sure that they are as flat as possible.

■ Firstly prepare the apex patch, this needs to be a double layer to sustain the stress of the pressure. Take the two apex patches and glue them together so that the curve of the circle is coincident.

■ While the silicone glue is drying proceed to place all the other patches as show on the diagram. Pay particular attention to make the borders of the patch and those of the fly match as close as possible.

To ensure the sealing of the silicone place a thin layer of glue on the patch, spread it with the help of a plastic spatula, place the patch and apply pressure with the fingers. In case of bubbles or creases use a plastic spatula to squeeze out the air and stretch the fabric.