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Just dragged out my frequently used 3m Peak4 to look at the areas you described. Didn't have the glued patches detaching like yours.
I think the previous owner/user of your kite has a different concept of what "in very good shape" means
The kite may have been used frequently on the beach for teaching kite flying with lots of crashing into the sand. It may also have been left flapping for hours on the beach when not being used, which is not good for any kite as it will also weaken the fabric not to mention UV damage for long periods in the sun. These things could cause the problem and long periods in a hot car can also weaken stuck on on patches.
With second hand gear it's a case of buyer beware especially when you can't look at the kite before you buy. However on the positive side the patches which have become unstuck are mainly to protect the kite fabric from the ends of the plastic stiffeners. Even unstuck there is still protection. The critical areas of stress are really the bridle attachment points which I assume are in good condition?
By the way I still have a couple of new 3m Peak4 kites in stock if required
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thx for checking !
a friend just checked his 50+ session peak4 5m²... only 1 patch is unglued a few mm... This is not normal on my kite... 90% is partially unglued and full of sand.
i'll try to send the kite back to the seller, his discription does not match with what he sold (kite almost as new, I paid waaay to much)... according to him this is no big deal, and the kite can be used as such... yeah right... it's like selling a scratched car with a broken window and asking new price because it has only 10000km.
Bridle and attachment points and clothing look ok... and is like I saw on the pictures he sent me... but the patches were not visible ... 90% are unglued 5mm, some almost completely.
Probably combination of hot weather or a hot car and 'flying sand' on a windy day.
Nayy