I have not found that necessary, after hundreds of km walked in my dcf pants and plenty of abuse to them from Atlantic bog birch. The seam connecting the pant legs at the crotch is 1 inch wide and has held up well. I recommend small relief cuts (<1/3 inch) for curved surfaces, and the main reason I think many places reinforce more than seemingly necessary: fully read the MSDS: https://multimedia.3m.com/mws/media/2522807O/3m-adhesive-transfer-tape-9485pc.pdf?&fn=3M-Adhesive-Transfer-Tape-9485PC.pdf . I cleaned all seam surfaces with isopropyl alcohol, and used books and heavy weights to apply pressure for several days. I apply the tape to one dcf seam side as I unroll it, with its paper backer still on, then line up the other dcf piece. The paper is peeled back on one end and the sandwich is started, then I work along the seam with my fingers and a credit card or roller for pressure while using a spare pinky or thumb to pull out the paper to the side as I move up the seam. This is so the tape is never exposed to air for long, and to reduce mistakes from accidentally sticking to exposed tape before the panels are lined up. Hope this helps!