k rend on top sand and cement scratch coat

Is it doable ? Made a bo bo on a job.

Friend built a block wall and said he wanted it rendered.

I went there today, beaded and scratched it with sand cement all happy.

He rang me just now and asked me what id prefer weber or k rend for the top coat......

Ooops.

Both made a genuine mistake, he said hes happy for me to float and sponge it but I said ill find out if you can k rend on top s&c scratch.....


Any ideas guys?