Quick thoughts:,
could the patches have perrished in storage, exacerbated by the heat?
Is the tyre slipping round, pulling off the patches?
Could you try a repair late at night, when it's cooler incase the heat is drying the rubber out too quickly.
In Morocco the tyre repair shops put the patch and tube in a press while it cures.
Good luck
__________________
Chris
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"Never have a stupid argument with an idiot - he gets a lot more practice than you"
there I go again
not too hard really
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