You can use either a dry bonding gutter or the standard bonding gutter.
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.
Continue reading at slate roof repair worn out or select a topic from the closely related articles below or see the complete article index.
Installing a bonding gutter this video shows a roof repair and the fitting of a bonding gutter between a slate and a tiled roof but it will also fit two slate roofs together as well.
You might find problems removing the nail with the slate ripper.
I ve repaired complex metal roof flashings with torch down modified bitumen but there is a fire risk doing so.
Details are at slate roof leaks temporary repair once the necessary slates are removed the valley is usually replaced with new heavy copper or on some roofs folks use other flashing materials like aluminum i don t recommend that.