Fabric bonding repair

[Esser]

Ok, so a little disheartening at this stage in the game.

Had a friend sit in my plane and the fiberglass seat pan flexed, fell below the doorframe and shot out with enough force that it broke the poly tack bond to the door frame and now I have a fabric wrinkle. I’m wondering what the best way to fix this is. I’m thinking of getting some low viscosity crazy glue and injecting it under neath the fabric. Because it’s at the the door frame I’m thinking I will get some SS door frame covers and put them on with rivets as a secondary mechanical fastening method.

What do you guys think?

[jmodguy]

I’m thinking a 5 min epoxy. Used it to hold some seat upholstery where contact cement had failed.

[aviator79]

Ok, so a little disheartening at this stage in the game.

Had a friend sit in my plane and the fiberglass seat pan flexed, fell below the doorframe and shot out with enough force that it broke the poly tack bond to the door frame and now I have a fabric wrinkle. I’m wondering what the best way to fix this is. I’m thinking of getting some low viscosity crazy glue and injecting it under neath the fabric. Because it’s at the the door frame I’m thinking I will get some SS door frame covers and put them on with rivets as a secondary mechanical fastening method.

What do you guys think?

Do you have a picture? I'm not quite sure I follow how it happened, but the result is the fabric popped off the door frame. If it were me, I'd try using Poly Tak, thinned with MEK to an appropriate consistency instead of krazy glue. krazy glue is a cyanoacrylate that has low strength in shear, which, if I understand, is the failure mode that occurred. PolyTak, on the other hand, is very strong in shear. I'm not familiar with the covering system you used, but one concern might be that there is nowhere for the solvents to evaporate to if you inject adhesive under the existing coatings. They may blister.

The right answer is probably to remove that section of fabric and replace it. Since the fabric is already shrunk, you probably won't get the correct tension by just re-adhering the fabric.

[Esser]

It’s hard to see but the jist is the fabric cameboff the door frame. If I push the fabric back down I can almost get rid of all the wrinkles.

[aviator79]

It’s hard to see but the jist is the fabric cameboff the door frame. If I push the fabric back down I can almost get rid of all the wrinkles.

I'm certainly no expert, but if you can clamp it so the wrinkles come out, you might try to re-adhere that by injecting some thinned poly tak under the fabric. If it doesn't work, I think you're looking at cutting the fabric off under the door and replacing it. Not fun work, but pretty much a weekend project, with a lot of tedious masking and paint gun cleaning.

That's really a bummer, especially this close to seeing her fly. You'll get it fixed though.

edit: I was misinterpreting where the damage is. Still possible to repair I think though.

[aviator79]

Where did the seat pan contact the fabric to pull it off like that?

[PapuaPilot]

Did the bond break loose where it jogs through the door jamb?

If so you might be able to try injecting some thinned PolyTak / MEK through the fabric into the corner using a syringe and needle. While it is still wet clamp a piece of wood or angle iron into the door jamb corner. This should pull the fabric tight. Leave it to dry overnight and see how it turns out.