Hi Hugh,

I've been down this path with my '95 850 sedan. I thought I'd share my experiences.

First, the reason it falls down is that it deteriorates. It's not just a fabric, but a foam-and-fabric, with maybe 1/8" of foam. After 15+ years, the foam just breaks down. You can spray in glue, but the glue just attaches to more of the old foam, and it falls down again.

Also know that there is the fabric, and there is a fiber-board above the fabric. The fiber-board is what actually forms the headliner shape. It's a little bit fragile, so you need to be careful working with it, but it's do-able.

I took the whole fiber board out. It was harder for me with the sedan - I folded down the rear seat, manipulated the front seats, and had to work the fiber board out through the trunk. (Wouldn't fit through the doors.) It will be a lot easier for you with the wagon. You need to take off the handles above the doors, the sun visors, the interior lights (and trim), etc.

Once I got the fiber board out, I stripped the old fabric off, and used a stiff brush to scrub off all the old disintegrating foam. Shop vac helped to get it nice and clean.

Then, spray with adhesive, and glue on the new fabric. I had a couple of small rollers that I have used for installing laminate on a counter - they were useful for rolling the new fabric into the recessed areas of the fiber board. Let dry. Then, carefully cut out all the holes, and trim the fabric to match the fiber board.

I purchased the headliner material and adhesive from WLS Headliners, here:
http://www.wlsheadliners.com/catalog.html

I was quite happy with them, (not associated with them, just a happy customer,) and would buy from them again.

I bought 2 cans of adhesive; one is pretty much enough, but didn't want to run out with a little tiny bit left. I don't recall if I tapped into the second or not, it was a pretty close thing.

Reinstall the fiber board with the new headliner, installation is reverse of removal.

One issue I had - the plastic surrounding the sunroof opening had become very brittle over the years, and splintered into many pieces when I tried to remove it. It was right when Volvo was having supply issues with this part, so I drove around for several months using little office binder clips to keep things secure until I was finally able to get a replacement sunroof surround.

Hope this is helpful!

Roger

'95 854T 244k miles
'87 245 M47 278k miles
et al...