An old guy in a Tacoma supply house showed me a seam trick I still use
This was maybe 15 years back, I was grabbing some seam tape and a guy, had to be in his 70s, was watching me. He just said, 'Kid, you're gonna burn that seam before you roll it, right?' I told him yeah, of course. He shook his head and said, 'Nah, you gotta hit it with the iron after the roll, just a quick pass. Melts the glue up into the backing for good.' He walked me over to a scrap piece and did it right there on the floor. The seam practically disappeared. I've done it that way ever since. Anyone else pick up a little trick like that from an old timer that stuck?