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Thanks so much for your post!! Appreciate it. Can I also use a metal trowel?

external retaining wall.

I have applied the first coat of render to a few retaining walls made out of brick. I used a ready mix mortar. Question is how can I get the second coat smooth. Also if its not smooth can the uneven spots be sanded down. If so what sort of sandpaper grade or sanding instrument should be used. I...