Flying_john wrote:At the risk of being accused of thread hijack - a risk I am prepared to take
For the third time I have to redo the trims around the aeroplane windows. It is leatherette and this is glued to pressed aluminium shaped bits that screw on to cover the fixings for the window plastics.
Every time I have done it, after a few months, it just starts peeling. I believe it is the heat in the aircraft that is causing it. I started with a spray on contact adhesive, then a more expensive hi temperature version. Both failed. I have tried a single piece (there are 3 on each window) with old fashioned brush on evostick still failed, I experiment too with the modern white version of evostic, waste of time and doesn't smell as good.
It has been suggested that I rough up the ally even more and also fold more of the material round to the back, so as we are having the seats redone thought I would try again with the window trims.
Would welcome others advice / experiences.
Where does the joint fail (ie is the glue residue on the aluminium, the leatherette, or both?
Heat could well be your problem. Most glues soften with heat, and surprisingly little at that. My experience is from making guitars and ukuleles, and on a 30+ degree day just an hour in a hot car can be enough that important parts slide into different positions!
I can only think of three glue types which might stand that heat, though there are probably others.
Superglue (cyanoacrylate or CA). This cures to acrylic plastic, which requires more heat to soften than, say, woodworking glue or epoxy. But it's brittle and a knock or vibration will break the joint.
Hot hide glue, basically boiled up hooves and trimmings, effectively gelatin. This is the traditional instrument glue, and resists dry heat well (damp heat kills it, I believe Mosquitos dissolved in Burma). It will stick to shellac (French polish), which sticks to almost anything. I have both, so I could try it out if I had any leatherette. But hot hide glue is a bit tricky to use.
Resin based glues like Cascamite. But this has been reformulated recently and woodworkers now swear at it, not by it. However, its tougher brother Aerolite might be worth a try. Your friendly aero engineer should have some, and could advise whether it will bond to aluminium. It's expensive if you can't get a few dabs as a favour, and I don't know that it would work.