Sand blaster - absolutely. The first major tool in any shop should be an air compressor large enough to run air tools and preferably a media blaster. But the one tool that I consider the greatest advancement in my shop is powder coating. It's inexpensive, requires a VERY small air compressor and only an oven to cure the parts. No overspray, short drying time, and much more durable finish. My wife was so impressed she removed all the A/C defusers and window hinges and cranks in our house, sandblasted and powdercoated them. Our house is over 50 years old and these parts looked awful. Now they look as good as new and will last a long time. All I had to do was show her how.