Why makes the headliners in auto's drop down so bad?

Why makes the headliners in auto's drop down so bad?

There are many ideas as to why headliners drop down; but they all are just opinions; and like everybody else; i have an opinion too. My opinion on this is. . . We see more headliners fall along the seaboard and in humid weather instead of dry air. I believe that headliners come down because of the constant expanding in humid cool weather and contracting in hot dry weather of the cloth; year after year after year. After several years of this... the foam deterioates and comes apart; therefore causing the headliner material to come loose from the foam.

Comments

Hot Aussie sun boils the roof then you get in it , on goes aircon ,the glue can’t cope with temp going up and down makes glue brittle. No glue can survive years of that. After doing roof linings for job I now am without all my tools so I just paint thumb tacks top the same colour as lining and glue the long spiky bit that goes in wall. While glue is wet push them in about 3 inches spacing between them looks great.
Driving constantly at high speeds with the Windows open!
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