You might find problems removing the nail with the slate ripper.
How to repair a slate roof leak.
Or see slate roof repairs for a discussion of permanent slate roof repairs rather than the leaky slate roof holding action discussed in the article above.
Or see these.
You can use either a dry bonding gutter or the standard bonding gutter.
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To do this use the slate ripper to rip off the nail that hooks the slate onto the slate roof.
I ve repaired complex metal roof flashings with torch down modified bitumen but there is a fire risk doing so.