How to fix small cracks in flaunching?

[rhythmstick33]

There are a couple of very narrow cracks in my chimney flaunching.

The first one is about 1mm wide at ots widest:

The other one is a bit narrower:

I'm worried about the cracks getting bigger and ultimately letting water in.

A local builder has suggested using Leadmate to fill the cracks.

But I also heard that you can use some bonding compound (like this one: https://www.wickes.co.uk/KA-Bond-SBR-Co-Polymer-Bonding-Compound---1L/p/139061 ) that I can dilute and hopefully fill the cracks with.

Which option would be best? Or would you recommend something else?

Any suggestions much appreciated, thank you.

 

[catlad]

Bit late for that, You can paint it with acropol.

 

[rhythmstick33]

Brilliant, thank you.

 

[^woody^]

Cement grout

 

[rhythmstick33]

Cement grout

Cheers, but I think I'm going to go with the Acrypol as it seems like it might give an extra layer of protection should any more cracks form in the flaunching in the future.