Dunlop Fibre Cement Jointing Compound sanding timeframe?

[Davy]

Hi there,

I applied the dunlop Fibre Cement Jointing Compound onto blueboard last night and won't be able to sand it off until Friday will that make it harder to sand smoothly?

What is the recommended time frame to sand it off? I read on the container to allow 4hrs  before sanding is there a maximum time when it will be difficult to sand. And l baked it on heaps oops 

 

Many thanks

Dunlop 3kg Fibre Cement Jointing Compound 

[squeakysim]

Thanks @JacobZ 

Can you tell me what is your source of info? There doesn’t appear to be anything I can find that refers to the use of this in a wet area or under waterproofing.

I panicked last night, as I’d started to use this and was in the process of starting to stop up the wet area due to be waterproofed, when I realised the above. So I went and spent a hour wetting and scraping everything off before it turned to rock!! So I really want to be sure before starting to use it again!  

Cheers!

[JacobZ]

Hi @squeakysim,

It does not explicitly state that it can be used in wet areas, but as an internal and external jointing compound, it is implied that it is capable of withstanding moisture. When it is fully coated in a waterproofing membrane, it is going to be protected from any water anyway.

If you were particularly concerned, it might be worth grabbing some Gyprock CSR Wet Area Base Coat instead, as it explicitly states that it can be used in wet areas.

Let me know if you have any further questions.

Jacob