How many times have I looked at it and said, "need to sort that, stick it up, next time next time", but it never comes. Then when you decide to do it, what glue will I use that won't melt the deadening material above or discolour the lining. So what's the story or the answer guys.

 

I used Bison kit spray can on my Mercedes roof but that did not work at all.
After that I used Pattex High Tac and that worked perfectly well

 

Perhaps a spray on carpet adhesive will do the strick.

 

Yes I'm looking into spray carpet adhesive it came up on the last thread for is issue.

 

Beware if the spray adhesive is like a thin layer when applied, it will have not enough "body" to keep the lining up.
Like I said, Bison kit spray glue doesnt work because of that.

 

With most carpet adhesive you spray both surfaces and leave until its tacky like contact adhesive. and WD40 will remove any over spray.