Quote:
Originally Posted by TrumpetScreamer 
Thats good to know. I use Al Cass and have been thinking there was something wrong with my trumpet since the valves stick the day after I oil it.
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I'm thinking that may have more to do with the valve casing needing to be cleaned...
the real worry with evaporation is wear on the valves
I can't really say since i have no idea what you do to your horn
