once we put the first layer on and shrink and stitch, the second is added the same way with the exception of not doubling up on back in cove areas etc. I just terminate it at railing edge like a tape or maybe slightly wrap. we double wrap the leading edge on the first layer so no need for any extra on LE, i just terminate 1 inch on to leading edge sheet. if you do like me, you glue the perimeter then shrink the second , the activate it through, but when on bottom flat side beware it can stretch across and bridge. i pre tack through on the ribs and on the insp rings, to avoid this and the bubbles you mentioned . i have never did it the way the guy did in the Stewarts video. I like the second layer shrunk also, but his way makes perfect sense as to work it out as you go from center out. i may have to try that. But like i said before its not for everyone and not actually recommended. I like REAL numbers when I speak on anything so I did my Javron super cub and timed every thing like compare a conventional way on an PA18 elevator up to point of primer , vs. the double cover up to primer. (with the exception I covered the tail the Maule way), the time savings on mine was enough that I am embarrassed to post, to the point I could be called a liar . but some of the savings was the Maule way. BTW, when I'm done i want to come play on the river!!