I am about to finish off my inner fenders and was wondering if anyone had any thoughts on what to use. They have already been primed and painted, but I was not sure if I should put a rubberized undercoat or POR 15.

I have heard that the POR 15 is a very thick strong paint, and that rubber undercoat just traps moisture ( prolly the reason my fenders rotted in the first place)


Also, has anyone created bigger plastic inserts to put in their fender so rocks and such aren't hitting the metal fenders? Seems like the plastic from factory just stops things from flinging in between the inner fender and outer fender.

 

I have so many leaks under there that oil flings around all over and keeps everything nice and coated. It's been rust free for nearly 2 decades.

Not to mention that the wings are AI so I dont think they rust much.

 

Outer layer of body is 5051 Al. Will never corrode. Inner layer is steel which will.

 

Yeah I know the wings are AL, I am talking about the inner fender that I just spent weeks cutting and welding in new pieces. Everyone says rubber undercoat just holds moisture and rots it again, while other people say POR 15 is a very durable paint that people use to prevent rust on the underbody.

Pictures to gloat
http://www.flickr.com/photos/96646906@N03/10137585516/http://www.flickr.com/photos/96646906@N03/10137585516/ by http://www.flickr.com/people/96646906@N03/, on Flickr
http://www.flickr.com/photos/96646906@N03/10137633693/http://www.flickr.com/photos/96646906@N03/10137633693/ by http://www.flickr.com/people/96646906@N03/, on Flickr

 

I use the pro grade rubberize undercoat and love it. accidentally, used the non professional grade and it sucked, worthless..... moisture trapping, slow drying, crap.
the professional grade is the only way to go with the rubberized. its extremely durable, sound deadening, non trapping, but I spray a top coat over it.
I have not used the por 15

 

I would just use VHT Chassis and Rollbar paint. It will get chipped and rust will start. Then you just scrub the rust off with a wire wheel and spray it again. I wire off and spray my scuffs and rock rash about twice a year.

If you want a set-it-and-forget it coating, it could be expensive or elaborate to apply. I've never used POR15. It might be good. I've heard good things about it used on axle housings. That location by the tires will always get chips. I'd only use something that can easily be patched.

I like plastic inner fenders, but there's no room on the Land Rover. It rubs as it is. I have wheel spacers and I still rub the upper spring with narrow 255's.

 

Is there a certain brand in the professional stuff that you like? I like 3M everything, but if there is another brand that is better than I would rather use that.

 

I've use both rusto and 3m. I like them both.
I feel the rusto is better coverage per amount and the 1gallon sizes are easier to get.
so, the rusto is what I use.

 

I'd just use some rustoleum primer. Simple and it works. That's why it's primer-ed from the factory. Surface prep is important though. Remove dirt and oil. Any areas subject to rock impact should then be sprayed with undercoating.

 

So Rusty you have used the brush on kind of rustoleum? I keep seeing that, and I feel like that would be a much better option in certain parts of the bottom.

Also if you used the brush on stuff, what did you apply it with? I read about using a sponge like brush and not something with fine hairs.