Pull the whole molding off and put new double sided tape on it and start from the front of the door and stick about 4" on it and press so its pretty much stuck on there and get a blow dryer and heat it up and as it warms up a bit, slowly put it on while pulling and stretching at the same time and after you do that to the whole door, at the end you should have that inch or 2 you needed. That stuff is kinda like base for kitchen and bathroom floors and some times it shrinks and you have to do that only you stick it with glue.