Thanks for putting this altogether for me. I now understand whats going on here and the heat kinda put it all together.
I'm a sand blasting fanatic, I keep a dozen ceramic tips of three different i/d's in the garage as back up at all times.
Over the years I have herd of panels being destroyed but I have never personally seen it.
May just be sand blasting with common sense? Like using a 25 cent car wash and flaking the clear off?