While I can't provide the actual brand name of the products used in refinishing the bathroom in my '64 Overlander, I can relate what I learned through the process of having a professional bathroom refinisher complete the job on my coach.
1.) Preparation and cleanliness is a number one priority. Everything was thoroughly cleaned followed by wet sanding with varying grits of abrasive to get the needed surface tooth.
2.) There are a variety of materials involved. The materials, depending upon year and model of your coach, can include such things as ABS plastic, fiberglass, formica, plastic laminate, vinyl laminates, and/or aluminum. Each of these materials requires slightly different preparation as well as different primer and surfacers. Even utilizing a professional for my project, there were a few problems with getting all products in the same color; but in the end the job turned out beautifully.
In the end, I don't really think that I could have done the job for much less than the professional as I would have needed to purchase a number of expensive tools (not to mention the various primers and top coats at an average of $100/gallon). The total cost of the refinishing was just about $500.
An example of the results can be seen in the photo below:
There are a number of photos of the before and after in my album at Airstreamphotos.com - - both before (dated avacado green) and after (antique platinum). See:
Good luck with your project!