Installation of horizontal paneling on interior patio

[Flyfisher55]

Hello!
I'm planning to install Moelven's "livlig" panel, which is 13 x 120mm, on my enclosed veranda. The veranda is not insulated in any way, so there are significant temperature variations throughout the year and between night and day. It is water-secured but perhaps not completely condensation-free.
Do you think this panel is suitable for this purpose? A friend says I need to use stainless steel nails, is that correct?

Link: https://www.moelven.com/se/se/tra-inomhus/innerpanel/effekt/livlig/

 

[Huzzbutt]

Moelvens panel "livlig" s

The panel works, strong temperature fluctuations promise rust. Rust-free nails may be suitable to avoid rust spots in a few years.

 

[Leif i Skåne]

Use A4 stainless decking screws. They are best for hidden installation.