Protecting old roof ties exposed in shower

[saveasteading]

We have a few exposed,  weathered timber ties in a new shower room.

How best to protect them from water splashes?

 

We have discounted ' no nonsense' water repellent because I don't trust the quality ( I think kingfisher buy cheap and don't test). 

 

Any suggestions? I don't see why we can't use exterior quality.. 

 

The ties may be painted or stained brown, before or after.

 

Could we simply use exterior shed products?

 

Ceiling is plasterboard, and again we will use a branded silicone....I rather like Everflex.