I really hate this stuff, I actually get stressed out when I know I need to work with it. I have tried everything, putting it in hot water, blowtorch, microwave, it is just the pits to work with thi...
I just replaced all of mine (approx. 150 feet!!), and it went in very easy. I used the camco brand and it was very flexible. Are you sure you have the right size? What brand are you using? I bought a screen roller and did not even need to use it.