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I couldn’t find the original quote to review it but, you can use waterbased seam sealer on the seams, Gearaid makes a good sealer. Solvent based sealers will degrade the waterproofing in the material. You should start out by checking to make sure the tent material isn’t stretched too tight on the poles as this will open up the stitch holes. Then wet down the material and seams as this allows the fabric and thread to absorb the moisture and swell up closing the gap between the thread and the fabric. If you still have areas that are leaking seal those specific areas with seam seal.Did you find a sealing tape that you would recommend?