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My walls are plasterboard dot and dabbed on brick and a plaster finish. I have mapei plaster primer for those. I also have to tile on plywood. Which is the best primer? Could I use everbuild sbr bond? Would sbr bond be better on the plastered walls? It says mapei plaster primer is water based whereas sbr creates a rubber/acrylic seal. Or should I use bal sbr on the plywood and mapei plaster primer on the plastered walls? Thanks