Joint Sealing where the wall meets the ground?

[Udhi]

Hi all,
A neighbour has used a grey paint or sealant along the joint where his house meets the pavement.

It shows no sign of plants growth and seems like new after at least 5 years.

I want some!!
What is this compound? Best brands? Is there anything wrong with using this?

Simple answer is to ask him but I would only get one brand or recommendation with no caveats.

Any help please?
U

 

[Wayners]

Polymer mastic like CT1 and you can get in colours.
Maybe that was used

 

[23vc]

Ask them then come back here for options. If you think it might be a paint, it’s probably not a cartridge gun applied thing like CT1

 

[Udhi]

Yeah, great neighbour - "Cant remember, but I got it installed by the guy who did my flat roof". I cannot even detect tooling marks to guess if it was a mastic or a paint. But, it is THICK.

Can someone have a look at this and tell me what kind of exterior sealant or caulk is usable here.

One make is CT1 as Wayners advises, any more bids before I go and stick myself to the steps? I wonder if that Sika Resin grout might be an option, but is it flexible?

Pic for tittilation - it is NorthEast Facing, and the side of the house would be running Northeast to SouthWest.