Does Vandex need to be keyed before plastering over it.


New Member
Simple question I think. Apparently you can plaster straight onto Vandex. Now, I'm prepping the wall and applying the vandex myself and intend on getting in a plasterer to finish. The trouble is, I don't have a plasterer yet to ask the question: Do I need to leave a keyed surface for them to plaster onto?

The wall is interior brick and the prep involves flattening the surface and filling any holes with Rend Aid (which I will key some how) then apply the vandex. I've never used vandex before so any advice is welcome. Can't find any videos explaining how to use it in this context. Cheers.