Economical way to prevent dusting from AAC blocks in your garage?

Two main walls of my garage are made of Autoclaved Aerated Concrete (AAC) blocks and they produce a lot of dusting. Total surface I need to is around 25 square meters.

What can I use to prevent future dusting from the walls? I would prefer something liquid where I can use a roller or a paintbrush instead of preparing the mix with water (as this would involve more dust and efforth).

In case it matters, I live in UK. I seen people recommending PVA but I seen many types and I don’t know which type and quantity I need.

I also have concreete floor (15sqm) for which I need a solution, for the same reasons, I don’t want more dust in the garage. The garage is used only for storage, so I am not concerned much about traffic. Still, I don’t want to see the coating peeling from the walls or ceiling in the next 4-5 years.