I just got a new tent that leaked a little during our last rain storm. The rain seeped through the fly fabric and came into the tent. I'm pretty sure it didn't come from condensation or through a seam, but through the fabric of the fly. It's a polyester fabric that was supposed to be treated with a polyurethane to waterproof it. I called the manufacturer (Eureka) and they agreed to "inspect and test it" (but didn't agree to replace it at no charge). Rather than spend the $10 to send it to them and wait 4 to 6 weeks for it's return, I thought I'd buy some Scotchguard outdoor fabric spray or silicone waterproofing spray advertised for waterproofing tents and treat it myself. I'm looking for recommendations on specific products that have worked for forum members over the years. Thanks in advance.