Hello, I have an out of warranty Surface Pro 4 that I have been using since early 2016 with little issue, but recently the...

Hello, A needle and thread will technically work, but using a tape will be more effective in keeping the torn area waterproof. Here’s a website on how to repair waterproof clothing. There is repair tape made specifically for situations like this, like Gear Aid Tenacious Repair Tape, and Therm-a-Rest’s home and field repair kits. Hope this helps!