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Discussion Starter · #1 ·
I need to repaint both a garden wall and part of an exterior house wall that have previously been painted with something like Dulux Weathershield or Sandtex over the top of some powdery (distemper?) finish. The result is that whilst some areas are OK, there are large patches that are bubbling.

The last time I painted these walls, I pressure washed the walls to remove any paint that was obviously loose then painted the wall with stabilising solution followed by Weathershied - but clearly this was insufficient preparation in some areas at least.

What is the best way to prepare the walls to ensure that the coating adheres firmly and does not bubble away from underlying layers? I had wondered about maybe hiring a sandblasting machine - or maybe a needle scaling gun might be better? I have no experience of either so am looking for sound advice.

Many thanks.
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