Welcome to the forums. :)
Thanks :)
You should read the whole text the servers gives you. When you buy that spray permission you have to reconnect (or wait for a mapchange) before you can use your sprays.
Don't wanna be the i-know-it-all-and-i'm-better-than-you guy here, but i read the text that showed in my chatbox twice, and it said nothing about reconnecting as far as i know/remember, else i wouldn't have bothered to write this post in the first place.
But is it possible that the chatbox was too small and some of the text got cut off? or something else that caused some of the text to go missing? :s
Anyways, it's working now and i can use my sprays, i'm all good :)