Ok you've totally missed the point of the post.
BAL SBR,is based on PVA, it's a slurry primer it is fundamentally PVA with water based polymers added which alter the liquid so much that they are no longer PVA and are renamed as a result to SBR.
There is a product made called PVA External, it is wood glue for use outside which is water resistant, it is not waterproof and neither does it provide a waterproof barrier.
If the product Wickes are selling is a Polymer modified PVA they shouldn't be calling it anything with PVA in the name, it's misleading, people will assume that any form of PVA can be used as a waterproof primer.
It should be renamed to whatever it's been altered to, an SBR for instance.
My point all the way through this is, PVA is not waterproof until it's modified with polymer additives, when it's modified it's no longer PVA.
An analogy is this.
Orange juice is Orange juice, add vodka to this and its a screwdriver.
Can you describe this as Orange juice anymore? Not really something has been added to it and it's no longer the same product.
Do you get it now?
I stated way back in this thread, they are guilty of either misnaming or misrepresenting the product.
But whatever way round you look at it, I'll still not use it because it voids any guarantee offered by the major material manufacturers.
BAL APD is a wholly acrylic based primer it is not based, nor are any of it's components composed of PVA, it soaks into the surface of the substrate rather than sit on top of it and provides a chemical barrier that stops chemical reactions as well as draw.
But obviously you know better than BAL or Ardex on this point and feel a PVA water based sealer is far superior to any of the specialist acrylic products produced specifically for the job.
BAL SBR,is based on PVA, it's a slurry primer it is fundamentally PVA with water based polymers added which alter the liquid so much that they are no longer PVA and are renamed as a result to SBR.
There is a product made called PVA External, it is wood glue for use outside which is water resistant, it is not waterproof and neither does it provide a waterproof barrier.
If the product Wickes are selling is a Polymer modified PVA they shouldn't be calling it anything with PVA in the name, it's misleading, people will assume that any form of PVA can be used as a waterproof primer.
It should be renamed to whatever it's been altered to, an SBR for instance.
My point all the way through this is, PVA is not waterproof until it's modified with polymer additives, when it's modified it's no longer PVA.
An analogy is this.
Orange juice is Orange juice, add vodka to this and its a screwdriver.
Can you describe this as Orange juice anymore? Not really something has been added to it and it's no longer the same product.
Do you get it now?
I stated way back in this thread, they are guilty of either misnaming or misrepresenting the product.
But whatever way round you look at it, I'll still not use it because it voids any guarantee offered by the major material manufacturers.
BAL APD is a wholly acrylic based primer it is not based, nor are any of it's components composed of PVA, it soaks into the surface of the substrate rather than sit on top of it and provides a chemical barrier that stops chemical reactions as well as draw.
But obviously you know better than BAL or Ardex on this point and feel a PVA water based sealer is far superior to any of the specialist acrylic products produced specifically for the job.