Plaster / render key

[pyounger]

I have an external and internal wall to plaster / render respectively, I recently saw a chap apply a compound to both the internal wall (blue coating) and the external wall ( a red coating) which he said was to give a good ‘key’ and much better than plain old pva washes.

I forgot what he said the stuff was called - can anyone enlighten me and provide opinions as to its usefulness

thanks

 

[dontbelieveawordofit]

on the internal wall it sounds like he used blue grit, but it’s not a one size fits all product.
as for the outside i havent come across ‘red stuff’ . you could describe what the job consists of externally ? pva is not a solution externally whatever.

 

[pyounger]

It was a cement render with Many cracks and a few pieces chipped off on a chimney, the remaining original render far too hard to chip off to bare brick without taking A deep section of brick face off with it. So the guy used this stuff that, from the road, looked red and rough, rather like the blue stuff you use internally.

 

[dontbelieveawordofit]

there’s quite a few render products about . sikka and everbuild do rendagrip products. dont know what colour they are. i’ve never used them.
I make my own

 

[Bargain Bucket]

So he rendered over render?

 

[dontbelieveawordofit]

sounds like it from what you say