questions about cement plastering and bathroom

[pjeterschorstein]

Hey all! I'm new to plastering. I'm renovating some large property by myself and learning a lot of plumbing, some minor electricity, woodworking, metalworking, glasswork ext. It's going great as I'm putting 24h a day researching how to and working I'm getting really better at plastering, doing very nice corners ext. I come for the field of art and it really just feels like sculpting a wall. I used a scratch coat of builder sand+cement on bricks and marble sand-cement-lime mixture for top layer because that seems to be what they use here in Greece + some waterproofing additives on the shower walls.

I really like the look of the cement itself and wondered if i can make the whole bathroom and walking shower out of it. I keep only find information about microcement or other thin applications which are extremely smooth but I want it to have a more rough brutalist look. could I do it just by using a penetrative sealer or are there other considerations?
Thank you

 

[Swwils]

You can but the UK is not warm, you have to deal with the moisture very carefully.

 

[pjeterschorstein]

But I don't understand since I know it's possible to make even concrete/ cement sinks, you just need to seal it...