I used Venture stained glass tape on my last routed track in 1980. The track is still in operation in another basement and still has mostly original tape. I always liked taping a day after painting with semi gloss latex. I think the paint was still soft enough for the tape to kind of settle in and hold better.

 

Built my track in 2020 using the 3M Venture Tape Masterfoil Plus Copper Foil 7/32 x 1.5 mil. Still using the same original tape. Yes, the tape will tend to come up due to the contraction/expansion of the track. I just use a flat nylon stick or burnishing tool to press - burnish it back down without issues. I did have a break in a turn, but one can just use a small piece of copper tape and thin solder the new copper tape connection. Doesn't look pretty but it works. The track is painted with a satin latex.

Hard to find this tape anymore. Still looking for a suitable substitute. Way less expensive the using non-magnetic braid, so I deal with the continued occasional maintenance.

A trick that seems to help with stubborn spots, spray some gorilla spray glue (or something alike) in a shallow cup. Using a toothpick or similar, get some glue on the toothpick and then gently rub the underneath of the lifted copper tape. Reset the copper tape in place and burnish down again.