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My 740 sedan headliner sags and the car is so nice otherwise, I have finally found a line on a place that will do it for $250, so will go that route. Seems worth it, given the other posts confirm what a tedious and dirty and time consuming job it is to DIY. (What is the value of your labor in Dollars per hour anyway?)
I have heard that these older, (and newer also), Volvos use environmentally friendly materials here and this can mean as a result the headliners do not last as long as they otherwise would.
Last year I owned an '86 Cavalier wagon with this sagging headliner problem and tried the spray can with the tube through a tiny hole, it didn't work, just made a mess inside and outside and around the hole and only held up a tiny bit of the headliner. That is because it is practically impossible to rotate the straw in a circle through the pinhole you put it through and evenly distribute the spray. The headliner just will not co operate.
What finally did the trick was a liberal application of swingline staples.
Not looking concours afterwards but it did work, and was free. There are supposedly thumbtack like headliner fasteners made for this purpose,at some auto parts/supply stores also. Wooden and other kinds of roof bows and other exotic fixes but all of them just don't seem worth all the trouble.
In the end it depends on your time, and your budget, and how nice you need the car to look. My personal idea is save your money and have it done by a pro. A 740 is such a wonderful everlasting car, it really deserves it.
'91 740 sedan
'01 C70 HPT turbo coupe
and a '91 Mercedes Benz 560SEC coupe
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