Silicone is great. Cupcake trays,trekking tent flys, and Hollywood movie stars are all made from it – but it is really hard to seal fabric seams without a specialised urethane.
Did you know that Sil-Nylon tents are not seam-sealed at the factory? SilNet is a must-have for any silicone treated outdoor materials, and will apply in minutes and last for many seasons of use/abuse in the outdoors.