Rendering blocks on a pond.

[Rampage]

I'm finally rendering the outside of my pond wall.
It is made of hollow (figure of eight) blocks.
Should I use PVA to seal the wall first? Or just wet the wall and start rendering?

Thanks,

 

[Alastairreid]

Dampen the wall down, dont use pva.

 

[Rampage]

That's what I did!
Thanks.