I have a TP Pressure Pot and-anyone using different media with success for metal?

I used this thing about 10 years ago to restore a Chevelle and it definitely took everything off the metal. And I got extremely lucky not damaging the metal on the car. I used what is called Black Beauty. It is a fairly aggressive sand. Fast Forward to now and I am wanting to strip the underside of the Hood and Trunk on my duster. Any one using a safer media in the Pressure Pots? This won't be a huge job and am wanting to make use of my equipment and I am being told I won't get lucky twice on not damaging my metal lol....

Thanks,
JW