And that's the silicon glue you can use if you really should have a silnylon tarp.
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outdoor.mcnett.eu
Attention!
Some tarps and tents and ponchos are made from polyester with a PU coating.
For that this firm offers another special seam glue.
ATTENTION!
In the USA since a couple of years real silicon Nylon tarps and tents are interdicted.
(They think it would be dangerous with fire.)
Newer US American products have sometimes at one side silicon but at the other side PU!!!
If you should own an US or Canadian Product you have to know that!
It is needed to stich the corner and repair it with a silnylon fabric. Hilleberg for example sells small bags made from silnylon.
Extremtextil in Germany would be the shop where I would buy silnylon, would I live in France I would ask Tipik for a piece of silnylon. Or I would ask him to repair the tarp. (he speaks English by the way.)
In Oranienburg we have a specialised outdoor cutter like this too and in colone the ultra light rucksack maker Laufbursche who could help me in Germany.
(But I asked a normal cutter master to make exactly that work for me to attach loops at my Polyester/Pu Decathlon Solignac hunting poncho, because I want to try, if that holds the forces. Unfortunately I didn't find the time to seal the seams and have currently no pictures of that work, which looks very similar to the Hilleberg tarp corner.
I haven't the poncho with me and can't make a photo in this moment. I will show it later, when I come along in Colone, where it is. But this will take minimum two weeks, depending on my job.)
What I want to say is:
Every good civil cutter can do this work, if you show him the photo from the Hilleberg corner and tell him, that it is INSIDE the tent.
But I don't know who sells silnylon in Britain and I don't know who produces small series from that fabrics there.
If you do not find it, you should surch for the British ultra light trekking forum and ask there. The ultra light trekking community is very very good in do it yourself, because they surch for new options and the best solutions with that new fabrics.
And they use mainly silnylon tarps!
May be, that somebody sends you such a little piece for free.
I wouldn't use a different fabric to repair it, because I think, then you wouldn't get the seams really tight. But about this I am not sure.