Water leaking passed slates

Joined
16 Dec 2022
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United Kingdom
Simple question here?
How does water get passed slates when they are showing no wear or cracks?
My only feeling is water gets passed between the slates laid on each other?
If that's so why amI told not to seal the edges of the slates, because in my mind wouldn't that stop the leak?
Next question is?
Could I use a filler paint so I could paint over the tiles, first protecting them from the weather and second stopping water getting passed them?
 
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