When your roof lining starts to sag and droop it tends to take your general mood with it, so Bobby recommends you do something about it and quickly, because this kind of ailment in a cabbie tends to get worse and worse until it literally gets into (onto) your head.
Now, up front please note that this is the kind of DIY job, if you choose to do it yourself as the name implies, that can go horribly wrong. So if you have your doubts, get a professional in.
However, as bucks can be in short supply, here’s some hacks that you can try, to put the ‘up’ back into your roof upholstery.
The sag happens when the glue loses its stickiness. So, if it’s just the edges, then buy a good spray glue, even a specialist roof lining one, to make sure the glue is spread evenly. Mask out other areas when doing this and never apply too thickly as it will soak through the cloth and get ugly. Use double-sided tape where you can get behind the cloth conveniently.
Here’s an interesting one, and it involves staples and hairspray and is recommended only for old tjorries that you want a quick fix on, but not necessarily a perfect fix. Simply staple gun the cloth back into place and use hairspray to create a stiffness that will (hopefully) hold it in place.
Another hack is to get a steam cleaner, heat up the old glue through the lining so it gets moist, and use a paint roller to press it back in place. This won’t work if the glue is too old, and might just have the opposite effect, so try on a small area first.
These are all temporary fixes, and the best thing to do is get a professional to remove the entire backing board and redo the job.