How Do I Force the Plastik Theme Across All Applications?

Help
1

I set the Plastik theme as the current default theme, yet some apps (but especially GNOME applications), revert to the Plasma default theme. Is there a way to force the Plastik theme across all applications?

2

I’m afraid not; GNOME apps aren’t easily themable, and this is by design.

3

So then, how do they work with the default Plasma theme? After all, it is different from the default GNOME theme.