Ive used epoxy resin mixed to a stiff paste with coarsely powdered brick then work dry powder into the surface if it looks shiny..works a treat on stone work too.
Edit. stopped typing to watch the end if the chase Tigercubrider
problem with usin brick dust is that these bricks only have the colour burned on the outside - the face skin.
as suggested, brown silicone/sealant will do.
it will weather to match in time.
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