Sbr Bonding Coat - Tile Advice

[Callisto]

I am having the walls skimmed next week and I know I have to use Sbr primer on the areas I'm going to tile, the problem I'm having is does this need doing just prior to tiling or can it be done in advance?
I'd like to apply the Sbr and mist coat(where I'm painting) and then put the bath back in. I'm just not sure about leaving the fresh plaster unsealed whilst I carefully use the bath (can only borrow a shower/bath so many times).

 

[White Room]

You don't need sbr where your going to paint, the mist coat will suffice, sbr where your tiling should be done so it's dried before fixing tiles.

 

[Callisto]

You don't need sbr where your going to paint, the mist coat will suffice, sbr where your tiling should be done so it's dried before fixing tiles.

Many thanks, that makes my life a lot easier.