DIY - Flat roof meets wall, i.d needed for sealing product

Trekkie81

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First post. Hope someone can help.

Looking for the light blue / grey product that is sealing between the yellow down wall and the tar/bitumen roof (no idea what its called)

Job was done few years ago and the black stuff came in blocks and the guys came with big containers and gas bottles and melted and poured it on the roof, that was already concrete. But some of the gaps between wall and roof have cracks that weren't filled in, so rain is sneaking in at a few spots, so I want to get that blue/grey stuff and fill them in. The stuff is rock hard still and doesn't seem to crack so it seems to be doing the job. Any i.d for it would be appreciated, thanks
 

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Have you tried Lava 20? Great stuff by all accounts. Loads of stuff up on YouTube on it.

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