Ok my Park Ave the headliner is sagging slightly around the hole where the sunrof is, what holds that headliner up tight tight to the roof ? I was going to try silicone sealant and clamp it in place for a day or so ??

Doesn't the "U" channel trim around the sunroof opening hold that part of the headliner?

Right around the sunroof hole is a molding that covers the cut edge of the headliner material. That helps to hold it up in place right around the hole. But, usually when the fabric begins to sag it is because the bond between the foam backing and the fabric has failed. Unfortunately, the only good fix I know of is to remove the headliner on the pressed fiberglas backing board from the car; remove the fabric and deteriorated foam from the board; and apply new foam-backed fabric using spray adhesive. Cost to do it yourself is about $100. Cost to have it done is about $3-400. It is not an easy job to do well.

If you find a method to tack it up in place that works, you will be a real hero. It is not an easy problem. The fabric'* foam backing deteriorates into an oily substance that makes re-gluing in place very difficult. Making it more difficult, adhesive added in place may bleed through the fabric in an unattractive manner. Finally, where the foam has deteriorated and the fabric has been successfully reattached, it usually assumes a lower contour that is unattractively visible from below.

BTW, humid conditions, like when the car has a water leak into the interior, will greatly increase the weight of the headliner fabric through absorption, and encourage it to peel away from its backing and sag. Sags can be minimized temporarily by drying the fabric with a hair dryer or heat gun, but don't get too close or stay in one spot for too long, or the fabric will melt.

there is no trim ring or moulding the headliner just sorta bends up around the edge and when you slide the cover forward the two meet.. The liner material is tight to the backing board but it looks like the backing board was glued to the underside of the roof. i am going to try silicone and clamp it up in place ??

pics are great when the car is not a Bonne.....

OK, thanks for making that more clear. If the headliner backing board is sagging down, perhaps your fix might work. In the Bonnevilles I have worked on, there is nothing to hold the board to the roof except near the outer edges of the board. But the board itself is a pressed composite heavy in fiberglas. The ones I have removed are usually dusty, and that would make it difficult for adhesive to stick. If you can get it to stick and don't lift it so high that it interferes with the sliding shade or roof glass, that would be swell. Be careful of clamping though. Unless the force is applied over a wide area, you may leave permanent unsightly indentations in the liner material. Sometimes, as the fabric and foam backing age, indentations from pressing on the headliner do not rebound but remain permanent.

Can you take some pix and post them? If you can effect a good fix, you could help out the next guy with the same problem.

I think my fix worked ( fingers crossed) I used a long pc of wood under the clamp so as not to crush the backer. I will take the pics but how do I post them ??

http://www.bonnevilleclub.com/forum/...ic.php?t=66097

?????????????? Wow where the heck do I get to that screen to post the pics

http://www.photobucket.com is a free web-hosting service for pictures. It will resize your pix to 250kb, so, if you have a photo editor, your pix will upload from your computer a lot faster if you keep them less than 250 kb. Also, if you are able, keeping the width of the picture 600 pixels or less will prevent readers from having to scroll left and right through the entire thread which is what happens when a wide image is posted.

Anyway, once your image is uploaded to the Photobucket account, just cut and paste the lowest image address under the picture into your message here on BC.