ᐅ Applying Joint Compound to Drywall in the Bathroom

Hello, for our bathroom renovation, I bought a hydropanel.
At the hardware store, there was no special joint compound available for the seams. The salesperson said that regular drywall joint compound would be sufficient since it will be primed afterward anyway.
However, I’m not entirely sure if this is okay or not.
What do you think?

The Hydropanel (assuming the one from Rigips or the Aquapanel from Knauf, etc.) is a cement-bonded board, not gypsum-based like drywall or gypsum fiber boards. The joint filler for gypsum boards is designed accordingly and is gypsum-based. Generally, you can use this type of filler, such as Rigips A828, but I would recommend using a suitable filler or joint adhesive from the board manufacturer. This way, you avoid creating a weak point, especially in areas like showers, where gypsum fiber and drywall are not appropriate since it is a wet room, not just a room with increased humidity.

Plaster in the bathroom is always a tricky issue... we have had bad experiences with it.

Which drywall panels should be used for the bathroom? (e.g., for the shower?)

Just use the green drywall board. It is suitable for wet rooms. Then, make sure to properly prime and seal the wet area, and that should be sufficient.