coating lang siguro yan bro.
else that's one very expensive guitar you have.
polishers are actually abrasives...very kind abrasives. so if you use polishers on a piece of gold coated metal, the gold coating will disappear after some time. but if the metal is of solid gold, then it will simply shine.
the only way to get that shiny gold back is to have it plated again. ipapatubog ulit yan.
pag makapal naman ang coating, dapat basahan eh okay na. on the other hand, a very mild abrasive should make it shine but the more you "shine" it, the thinner the layer will get.