How to fix a gap between my rendered fence and the fence cap?

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How to fix a gap between my rendered fence and the fence cap?

Hi all,

Just joined today & happy to get some expert advice.

My fence cap was rotten and I have replaced it. The fence has been clad with a cement sheet and rendered red (tyrolean). The gap between the fence cladding and the capping is around 3 cms. I need to fill the gap with a paintable medium (some adhesive) so that the gap is invisible. I can then paint it with the colour of the cement cladding. I have attached pictures. Please advise as to how I can go about it.