When I was doing my panel I ask a company about doing it in plastic and they wanted BIG bucks. I was sick at the time and basically had only part of one side to go so I took it to them just to see what it would do. I ask the guy to also hit the inside where I would be painting. They later called and told me it was ready and I owed them $545. This was around 2012. I took a good friend with me to talk to the OWNER of the place and walked out with a bill of $250....more like it.
Since that time I have a 5 gal bucket of the plastic just like what they used and saving it for something sensitive. Most everything I have needs fine sand blasting. I will have to find it but I do promise you one thing.....if you have any rust what so ever plastic will NOT take it off. Just paint.
just fyi f rom my perspective.