Wow Im impressed with the amount of blasting you've got done with that wee little compressor.You must be a patient man...lol!I burned up a similar one,had a brand new motor.One cylinder went bad while I was spraying,didnt notice.Ended up burning the motor out.
Now I have a 60 gal...
Be aware that reusing sand can cause more rust.The sand can pick up contaminants and moisture.reusing it puts it back on the car.Filter it very well.Make sure it's dry!