An urgent repair, another challenge (En/Fr)

in DIYHub11 days ago

My wife gave me another repair challenge.
But this time I had a deadline of a day and a half.
Her pool shoes were torn, and she had an aqua gym session the following evening.
I hate being pressed for time to carry out a repair; I like to let ideas ripen in my mind and project in my imagination the different methods, their implementation and the final result.
This usually leads to very good results.
But in this case, I had no choice if I accepted the challenge.

So I started by doing some research on the internet. These shoes are made of silicone rubber, and it's a difficult material to repair except with professional glues that are hard to get hold of and probably very expensive, so it's not my approach.

Silicone has the reputation of resisting adhesion, which is why it's used in molds for cooking, for example, and glues won't stick to it.

I imagined doing a hot repair with a soldering iron, by melting the silicone, but my research dissuaded me: it degrades and hardens when exposed to high heat.

So I opted for a more traditional repair, simply stitching the tear with the thickest sewing thread available.
I hadn't chosen this route at first, as I imagined there would be a risk of the silicone tearing at the threads.
In reality, as I sewed, I realized that this silicone rubber was very dense and very difficult to pierce, and would resist well to the traction on the threads that would be exerted only when putting on or taking off the shoes.
Once the shoes are on the foot, there's no stress on the repair.

I did reinforce the repair, but mainly for aesthetic reasons, covering it with clear sanitary sealant silicone, on the assumption that the silicone would stick to the sealant.
It did, at least at first, but as the surface is flexible and deforms, it won't last long.
I'm still looking for an idea to reinforce the seam.

In the meantime, the shoes were ready in time for the aqua gym session, and they've since done another one, as well as an aqua bike session.
Another successful challenge, although I'm not sure it's sustainable in the long term.

If you've ever repaired items made of silicone rubber, I'd love to hear your tips.





FRENCH VERSION

Mon épouse m'a encore donné un challenge de réparation.
Mais cette fois ci j'avais un délai pour réussir, un jour et demi.
En effet ses chaussures de piscine présentaient une déchirure et elle avait une séance d'aqua gym le lendemain soir.
Je déteste être pressé par le temps pour effectuer une réparation, j'aime laisser les idées murir dans mon esprit et projeter en imagination les différentes méthodes, leur mise en oeuvre et le résultat final.
En général ça me permet d'obtenir de très bons résultats.
Mais là je n'avais pas le choix si j'acceptais le challenge.

J'ai donc commencé par faire des recherches sur internet, ces chaussures sont en caoutchouc de silicone, et c'est un matériau difficile à réparer à part avec des colles professionnelles difficilement accessibles et surement très chères, ce n'est pas mon approche.

Le silicone a la réputation de résister à l'adhérence, c'est pourquoi on en fait des moules pour cuisiner par exemple, et les colles ne tiennent pas dessus.

J'ai imaginé faire une réparation à chaud avec un fer à souder, en faisant fondre le silicone, mes recherches m'en ont dissuadé, il se dégrade et se durcit exposé à de fortes chaleurs.

J'ai donc opté pour une réparation plus traditionnelle, simplement recoudre la déchirure avec le fil de couture le plus épais qui était à ma disposition.
Je n'avait pas choisi cette voie au début car j'imaginais qu'il y aurait un risque que le silicone se déchire au niveau des fils.
En réalité, en cousant, j'ai constaté que ce caoutchouc de silicone était très dense et très difficile à transpercer, il allait bien résister à la traction sur les fils qui ne s'exercerait qu'au moment de mettre ou d'enlever les chaussures.
Une fois les chaussures sur le pied il n'y a aucune sollicitation au niveau de la réparation.

J'ai tout de même fait un renfort de cette réparation, mais c'est surtout esthétique, je l'ai recouverte avec du silicone transparent pour joints sanitaires, en imaginant que le silicone pourrait coller au silicone.
C'est le cas, du moins au début, mais comme la surface est souple et se déforme, ça ne durera pas longtemps.
Je continue de cherche une idée pour renforcer la couture.

En attendant, les chaussures étaient prêtes à temps pour la séance d'aqua gym, elles en ont fait une autre depuis, ainsi qu'une séance d'aqua bike
Challenge réussi de nouveau, même si je ne suis pas sûr que ce soit durable sur le long terme.
Si vous avez déjà réparé des objets en caoutchouc de silicone, je suis preneur pour vos astuces.

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