How long to wait before grouting with tiles on BAL WP1

[MadWelshWizard]

Hello,

I've put my tiles up with Wickes waterproof tile adhesive ontop of plasterboard covered with BAL WP1 tanking kit (& primer).

I was wondering can I grout after 24 hours or do I have to wait the 72 for 'Impervious' backgrounds ?

The room is cold/medium temperature, it doesn't really get hot in there.

Any help on this would be great, I've had loads of help so far and the bathroom progresses well (apart from delivery cock ups !)

Thanks,

Craig

 

[gcol]

3 days.

 

[MadWelshWizard]

Thank you !

Craig