Hey everyone, Recently I just bought a Bach Stradivarius. The sound is great, and the horn was made in the 70's, I think. The serial number has 5 numbers in it and is in the 60000's. Over the years, most of the lacquer has worn off and it looks very tarnished, with a lot of reddish-brown areas. The owner told me I could polish it using brass-polish, and then simonize it. My question is, should I consider getting some sort of coating on it to prevent tarnishing? I've heard of just a clear coating, not necessarily lacquering or plating. the owner told me lacquering would be an awful idea because it would change the sound quality and bring the value of the horn down 50%. If possible, though, I would like to protect the trumpet from future tarnishing. Thanks!