Can anyone offer advice on how to keep the rain from dripping through a canvas top? Top about a year old, and was completely watertight until I told a friend so two weeks ago. The next rainstoirm the rain came straight through - soaked everything. I have tried Scotchguard and some silicone based thing. Has helped but there are still areas, especially the seams, that are leaking heavy drips (one on my head). In FL and the rain is copious and heavy. Many thanks.