On Saturday, 11 November 2017 16:28:51 UTC, Michael Chare wrote:
Is there anything better than black exterior mastic (frame sealer) to
repair a foot long crack in a bitumen felt roof? The crack is near the
edge where there is a lip to control direction of water flow.

Some has used what is now hard grey stuff to repair some previous
blemishes in the tiles. It is subsequently cracked.


--
Michael Chare

Flash band on top of bitumous mastic.
Use the flashband primer.
Best done in warm weather. Unfortunately.