Re: Undercoat - Amsoil HD Metal Protector?
BManz, I did the Amsoil HDMP spray-on when I got my WK2. Now I have 65,000 or so miles and it is still in place and I have not a trace of rust other than what was there (surface rust on suspension parts) when it was new. Consider mine has two winters and a lot of Florida salty sand in between.
When you spray it on it applies with the consistency of PAM cooking spray or perhaps WD-40 and leaves a slight tacky wax film after it dries for about 24hrs; I rubbed mine with a cotton towel after spaying it on to ensure it adhered on large flat areas. Also, it will smell like crayons for a few days but this smell goes away. This particular product has been applied to all my vehicles since 1999 but I don't know if you can buy it retail or not anymore; I got two cases from an Amsoil dealer I met several years ago and one can will cover the entire underside of a large SUV. Cost was about $5/can at that time, IIRC.
I am certainly not fond of the multi-level marketing scheme Amsoil employs nor do I use their lubricants (nothing wrong with them, though), but their heavy duty metal protector is an inexpensive and effective undercoat. Some Jeep Wrangler off-road club people use it to keep mud from sticking to their frames, so you may want to check with those kinds of groups too to see how well it works in more severe conditions. For road and light trail use in mine it is doing a good job.
An expert is one who knows more and more about less and less until he knows absolutely everything about nothing.
2011 Jeep Grand Cherokee 4x4 Ltd
Silver, Hemi, 20" wheels, minimal doodads.