Okay so I'm working on a hex tarp out of 1 ounce hyper-d fabric. Will waterproof later. I sewed the two pieces together using a felled seam, but I can clearly see the thread holes along the seam. I don't know if a silicone treatment will be able to satisfactorily close the holes to the point where water won't get through. How do you waterproof the seams? Some sort of seam tape? Or did I use the wrong kind of seam?
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