Butyl tape for aluminum gutter ?

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Hi what is better at sealing the joint on Aluminum and plastic gutter corner bitumen or butyl’s tapes ? Or alternative the best sealant to use ? Cheers
 
Problem is the movement which is why gutters have rubber gasket.

I'd try gutter sealant. Polymer based...
 
Thanks and which is recommended and Suitable for aluminum and plastic cheers
 
I've used gutter sealant and it's ok for a few years, then it hardens and becomes brittle.
Lead sealant is my favourite, after 18 years in my house the gutters and downpipes are still leak free.
 
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