If your car has seen its share of wear and tear over the years, it's likely possible for the headliner to start sagging. It may start out as heaimple bump on the headliner, but sooner or later, bigger parts of the headliner fabric will start to sag and fall down on you and your passengers. Fortunately, this sagging problem can be solved by using a headliner adhesive. Now you might have heard negative reactions about the use of this adhesive.that it doesn't work or that it won't stick properly to the surface of the liner. To help you easily fix heaaggy liner, here are some tips on how to apply and use the adhesive properly during a headliner installation.
Double-check if you've got the right adhesive for the job.
Some car owners opt to use a universal adhesive to glue heaaggy headliner back in place. Unfortunately, many of these universal adhesives are not meant for automotive use. So before you cause yourself unnecessary frustration because the fabric or liner material won't stick, double-check first if the glue you're using is for automotive use. If not, get your hands on a real, high-quality headliner adhesive.
Completely remove the old liner material.
The headliner comes with a fabric or foam backing attached to a board. Usually, if your car's liner needs replacing, this foam backing would have started to crumble and fall off in pieces. Before you apply the headliner adhesive, make sure that no old liner material is left on the surface. Keep in mind that an uneven surface with bits of foam won't let the new material stick to it no matter how much glue you put on it.
Aside from the liner material, you'll also have to deal with pieces of the old glue stuck on the liner board. Using a plastic bristle brush, brush these bits and pieces off until there's no residue left. This might take a lot of time, especially if the bits and pieces are hard to remove. Be careful when removing old glue since you don't want to scratch your car's fiberglass frame, the structure on which you attach the headliner to.
Carefully apply the headliner adhesive.
Once you've completely removed every bit and piece of the old foam and glue, spray or spread the glue on the surface. Do this evenly and generously until all the appropriate areas hre covered.
Let the headliner adhesive tack properly without completely letting it dry off.
This means you have to wait a bit before sticking the new headliner material to the board. Adhesive bottles or tubes usually have a recommended tack time on their labels, which can last from two to ten minutes. After letting the glue tack properly, place the new headliner in position. Make sure you don't wait too long before attaching the new material because the glue will become useless once it completely dries off. It might sound confusing since you have to let the adhesive tack first. So to make things clear, let the glue tack according to the manufacturer's recommendations, and then immediately stick the new liner material in place to maximize the glue's bonding capacity. Remember, if the headliner glue wasn't given the time to properly tack and bond, it will easily lose its adhesive capabilities especially when exposed to excess heat.