Do a little searching on this site .I do remember John posting some pictures when he and his son  started.
Pretty sure it was por 15 or piss por 15 as some call it. To each his own there is nothing wrong with a good old fashion paint job with some good quality paint. I've done several that way and it has held up rather well.
Plus powder coating could be very costly to do the whole chassis. Good luck with the search.

John did silver POR-15 and said if he had it to do over, he would have gone with black. Apparently the silver color is not very consistent and was like water.

I have done a lot of powder coating. I would say stick with POR-15 to make any touch up easier down the road.

Jay 

Jay, I had the same problem with Red POR-15. I was going to paint the transaxle on the Super T and it looked watered down and transparent when I applied it, so I ended up spraying it with a high temp red. However, I painted the pan with Black and it turned out great!

There are pics of my Berrien chassis at this link. http://smg.photobucket.com/albums/v635/Yellermanx/?start=all  I see no need for POR 15, just use auto paint unless you are going to be dipping it in the ocean.  JMHO

I wanted to use the POR15 for a couple of reasons. I had no time to prep the chassis for the buggy build.
POR15 was something I always wanted to try and thought it would be a good chance to use it.
I went with silver for contrast for the build.
I thought it would make all the different component parts show up better black beam black transaxle ect...

It was really odd and different applications of it had different amounts of metallic. It was hard to stir up enough to get a consistent color so some of the chassis looks like hammer paint. Most of the imperfections were on the upper side of the chassis. We did paint the bottom first and it was smoother than the second application on the top side.

The black I have seen is much more consistent and just looks like wet paint.

In West Virginia and Ohio we have snow and salt and even Brine put on the roads so, it can be like dipping it in the ocean. Then there always the Manx at the Banx run coming up too....
John

Try this link...

http://s23.photobucket.com/albums/b372/dunebuggyarchives/BuggyBuild2008/Page%203%20Chassis%20Preparation/