Missbish double sided tape sticks like you know what to a blanket, first mask the edge and then stick the masking tape to the double sided tape, then you don't have all that goo to get off.
I use MEK to clean up afterwards "Methal Ethal Keytone", it is just strong enough to remove the glue residue and any tape backing that has been left on the rubber, does a nice job.
As for a guide I have different widths of masking tape, and on the side to glue use the tape as my marker and makes a nice straight glue edge, so not so much cleaning afterwards.
This free sticking with the dexterity of the fingers I can not get right, so if on a curved section take both pieces to be glued, an inside and an out side, for you want the shiny side the same, back it with tape keeping the lengths the same, the tape will now inhibit it from stretching.
Lay a strip of double sided tape flat and straight on a piece of board, now stick the one side down,you have your masking tape giving your glue guide, kleen and apply glue.
Your reverse side is kleened and glued, let dry for 5 mins or moreI have found even 1/2 an hour later it still sticks fine, then start to work the 2 joints together, because the rubber can not stretch it is forced to take on that straight edge, but when releasedyour curve will be there.
Now that I have got myself completely confused with the telling, I hope you made head or tail out of it.
I have used all sorts of curves, like my knee , sofa arm, bottles pieces of plumbers pipe, a box full of wierd and wonderfull shapes to get it right, but so far have been very successfull, and my cat suits are every bit as good as bought ones, and they are custom made with not a wrinkle any where.
Now all I need to do is find out how to post pics, I just cannot get that rite.
Have the cammera, tripod, taken good pics, and then transfered them to my computer, then hit a brick wall, how to resize, all this pixel, KBs, I just don't understand, I think you could teach me the Swahili language quicker.