I have sprayed Kilsaren Super Bond their rend-aid equivalant. It was a few mm thick then meshed then a light spray over and scratched.
But as Weber like rend-aid stippled as a key I have thought maybe pre mixed and sprayed on with a texture gun through the Ritmo? Not that I am likely to use rend-aid if I can help it. May have a job coming up that has to be Weber to match existing so just a thought?