I'm very fortunate that the plasti-coat is still holding up on my '90 Excella. There are 2-3 fingertip sized spots where it is gone, everything else is ok. I live in a dry area and store the trailer inside in the winter (when it's not in Arizona
) and I'd like to preserve the plasti-coat as long as possible.
I put a wax on it in February while in Arizona but wanted something tougher if possible. I had heard about Liquid Glass over the years when I was fooling around with show Porsches. But we were so hardcore we would only use carnuba wax applied by hand - literally by hand in order to heat it slightly (the Concours world is more than a little daft).
After doing some research on Liquid Glass I decided it might be my best bet for preserving the plasti-coat. I started working on it a few days ago and I'm about 75% of the way through applying the first coat.
First I washed the trailer with dishwashing soap in order to remove the old wax. Then, as this is a process taking place over several days, I do a segment at a time. I first lightly wipe it down with glass cleaner and a microfiber towel to remove any dust that may have accumulated since the washing. Next I use a medium grade polish and a Porter Cable random orbiter polisher set on medium. I like to polish until the polish has completely broken down and is more or less gone.
I then do another quick wipe down. The last step is the application of the Liquid Glass. After it hazes, which doesn't take long in our 90+ degree dry heat, I remove the excess with terry cloth towels (I find they're much more efficient than microfiber towels and they don't create any swirls or micro-scratches). I really like the way the Liquid Glass comes up easily with no powder or residue.
I'm going to let the first coat of Liquid Glass bake and cure in the sun for a couple of days and then apply another coat for added protection.
I used to detail cars primarily for improving their cosmetic appearance. I'm doing this more for preventive maintenance, but it sure looks great! The light polishing removed all of the water spots, drips and the like and the finish is uniform, shiny and smooth to the touch. I doubt it looked much better when it was new.
I believe that Liquid Glass is a polymer and does well when built up with multiple applications. It might end up being tougher than the plasti-coat. Time will tell - I'll keep the list posted as to how it holds up.
P.S. I made the mistake of buying the Liquid Glass at AutoZone - it's much cheaper at Amazon.
P.P.S. Some interesting reviews here: http://www.epinions.com/reviews/Liqu..._Polish_Finish