Water proof or normal PVA to seal / secure outside wall

[jonnybegood]

Hi all

I have been removing an existing wall coating from the outside of my property and now want to secure / seal certain areas before I apply the paint.
What PVA would be best, waterproof or normal, it is an external paint job so water proof would seem the obvious choice but seems that I will be painting over the seal does it matter and would a water proof PVA prevent the paint from being applied similar to when you try to paint over silicon sealant.

I have only ever used the normal PVA so unsure of the water proof part.

 

[joe-90]

PVA and paint are a marriage made in hell. Just use the right paint.

 

[jonnybegood]

Well thanks for that. PVA a NO NO then.

 

[confidentincompetent]

If bare surface is dusty, use a stabilising solution, if sound but bare thin down your paint as in mist coating for bare plaster.