Are Spotify Radio Thumbs Up/Down recommendations kept?

[user-removed]

I was listening to Spotify radio and some songs came on that I liked and some came on that I didn't like, so I used the thumbs up/down feature to improve the station. Is the station improved forever, or will the station reset when I close the app? If the station keeps resetting when I close the app, it would be pointless to use the thumbs up/down feature if it's only temporary.