Powder coat is a powder that you spray onto the enclosure and then bake on. It's exceptionally durable. A powder coat setup will run you about $150 for an inexpensive one, though you will also need an air compressor. And it's extremely messy. Unless you're doing tons and tons of enclosures, consider just picking them up from Pedal Parts Plus (if you're in the U.S.) or even direct from Hammond Manufacturing. PPP does great work, and the Hammond finishes are extremely durable if not particularly exciting as far as colors go.
It's four FETzer valves, so it does sound a little tubey! The channels are almost identical to the Cardinal's full-range band.





