I'm sure you've heard it all before

[timmyboy]

Not sure if this is really the correct place for this but nevermind.

I'm half way through fitting my headliner, it's all in and as tense as Christmas at the mother-in-laws, I have left it in the car for a couple of week now and keep tensioning every few days, but there are still creases from when it was packaged. I hung it up for about a month before fitting, I've tried heating it with a hair dryer but they seem to be stretches at the corners when it was folded not just creases.

Any suggestions?