My factory barrier coat on Asylum was flaking off in sheets. Interlux said I got enough life out of the paint, but it did not seem right to me. nevertheless I was faced with a complete redo. At the time, money was tight so I chemical stripped all of the old paint off then paid a guy to sand for new barrier coat. I put on 5 coats of barrier coat, then new ablative. There was not a single blister. No experience with the blasting but I don't see why it would not be OK unless he uses minimum wage labor.