Rubberized Undercoating

I just sprayed 3M Professional Grade Rubberized Undercoating on my 2008 Prerunner. I didn't really have any rust yet, so I thought this would be a good preventative idea. I basically just sprayed the lengthwise parts of the frame under the doors. Was this a mistake do? I have heard this can trap in moisture, and if so, what would be the best way to remove? Otherwise was this ok to do?

 

I really want to find a good coating to maintain my truck. I live in the NW and surface rust is starting. I would bring my truck to a pro if I knew I could go 10 years seeing lovely black parts under my baby. Surface rust looks so ghetto... and makes leaf springs creaky.

 

usually they pressure wash the bottom of the truck first, let it dry up a lil bit then spray on the undercoat. i couldnt see how a lil bit of water trapped in there could really rust anything. i have no idea how to get it off....i got my wheel wells sprayed also

 

Ok, so would it be a dumb idea to coat the ruberized undercoating with an oil or WD-40 to repell water?

 

I use the rubberized undercoating and i call bs on the trapped moistur theory... unless you truck is soaked when you do it!!

 

OK.. I know nothing about chemistry but doesn't it need oxygen to start the process? if so I would think that it wouldn't rust

 

Ther undercoating will crack and moisture will be there anyway.

 

Imo.... How will a coated frame rust more than an uncoated?....

 

Rust is oxidation. The reason cars rust in the nw/midwest/ect... is the salt on the roads or salt air from the ocean. Water itself isn't going to rust it out unless it sits there for a long... long.. long time. Even if there was a little bit of trapped moisture when you applied the coating... it shouldn't affect it. Even if it does, you'll never see it as it's covered and that tiny bit would never affect the integrity of the frame/panel. I'd leave it myself...

The real solution is to move to AZ.