Looking to buy a sand blaster, will be using it to restore a T truck. Which is the best one to buy, a pressurized or gravity fed? I have a new 60 gallon kobalt compressor that will provide 12 cfm at 90 psi.
Pressurized. You compressor is probably not going to produce enough cfm and it is probably not rated for continuous use. Take your time, and you can get it done, but rush it and you could ruin your air compressor.
12cfm @ 90psi is not nearly enough for much blasting outside of a box. The pressure type generally require about 30psi/3cfm for the pot and the rest for blasting but you'll want to dial-down on the blasting pressure for sheet metal. You'll still be working with square inches per minute instead of square feet per minute. If you can stand the boredom, you might get by but set aside weeks instead of minutes or hours for blasting jobs.
Check with TIP, they have good cabinet blasters and also blasters with dead-man valve. Don't even consider gravity types.