[Mitch Leland]

I have the same unit which I purchased for restoring an aircraft tug. I used 80 grit plaster sand for the steel members. The 80 grit sand either had moisture in it or debris because it kept clogging up. It's messy so you need to take it to an area where you don't mind having the spent media piled up. I don't know if you can recycle the media once you've used it. If you can't then using a high quality media can become expensive. I used it once, it was a hassle using it, I would sell it cheap... I think cheaper and better take the parts to a professional.