Chev4t6,
Here is a link to the final results of the Mar-K test. I'm glad to see the Por 15 and Behr black paint has held up the best because that is what I plan to do.
Mar-K bed wood test results Not as pretty as the clear coats though. I plan on using the bed for hauling stuff so pretty isn't necessary. You may want to consider a top for your bed to keep the rain and sun out.