[TR] Interior vinyl installation question

[Carl TR]

What is the consensus of the list about getting the wrinkles out of vinyl
before installation.

The vinyl has several 'in' and 'out' wrinkles where it was folded.   I tried
letting them sit in the Florida sun/heat yesterday but it had very little
effect.   Will they come out as I apply glue and stretch on the dash/cubby
door/capping pieces?  

Or do I try to steam them or iron them or something else such as wetting
them down before the sun/heat?

Thank you
Carl