A:
No, it's not waterproof my any stretch of the imagination. Those who tell you otherwise either haven't sit in it in a hard rain or at best sit in it in while it sprinkled. If you plan on sitting in it during rain, take rainwear!!!
None of the seems are sealed. You can see daylight out of the side and top seams, plus the windows leak as well. The accessory pockets beneath the windows are the only thing about this blind that is waterproof! They'll fill up with the leaking water and you'll have to cut holes in the bottom of them to drain them!