Quite accidentally, I removed the matte finish partly on my Matrix-12.? I had to clean off some of the foam from the road case which had adhered to the surface.? I used denatured alcohol which removed the stuck on foam, but removed the matte finish as well.? It did take a bit of "elbow grease" to get it all off however.
BTW:? I was going to sell my Matrix-12 soon, but was worried about lost value because the finish had been removed.? I am surprised some people prefer their instrument that way.
