One thing jeep got right...

[Austin 4x4]

Undercoating, even after 37 years that stuff is a PITA to come off.

[78J-10]

what is this undercoating you speak of??? must have been a at request item... or atleast it was on mine :lol:

[Mars]

Yeah I'm gonna have to ask about this undercoating thing.. I mean the rust all seems pretty standard.

[WHSII]

Austin 4X4

Undercoating is truly a pain. If you are dealing with small parts, try dropping them into kerosene. It will still be messy, but you can wash the undercoating off after a couple of days. A stiff scraper helps.

3M brake cleaner works grand to remove the thin film, Our NAPA has it on sale for $2 per can, it cuts it better than any other brand I have tried.

some strippers will soften it, then a putty knife with a thick blade putty knife / scraper will remove the heavy stuff. I like the one that is bent to get a better, lower angle to the item being scraped.

I know there are other ways, but the above ways are what worked for me. (wire brush on a grinder just gums up the cup brush) I have tried heat, it works but is a pain too.

[Austin 4x4]

the whole underside of my jeep has been coated. and not the cheap stuff this is atleast an 1/8 thick. really tuff rubber looks to be factory? only way to take it off with any progress is a heavy grit grinding wheel. im only taking off what i need to, no reason to remove good stuff.

[Austin 4x4]

looks factory?

http://i893.photobucket.com/albums/ac140/austin4x443/P8150061.jpg

[WHSII]

I do not think it was factory, probably a dealer add.

I removed all of mine and sealed it with two coats of urethane moisture cure, sealer, and then a top coat of urethane two part.

I had rust under the undercoating, even where it was not cracked, must have trapped moisture...

I left the undercoating on the fiberglass fenders, LOL why undercoat fiberglass??? It is very good at preventing rocks that fly up into the rear fenders from cracking the fiberglass...

The rust you cannot see is the main problem in my opinion. Inside of the bed supports, hidden areas that undercoating cannot get to. I used a product from http://www.masterseriescoatings.com/index/ called EECI, that is an additive to rust preventive paints. This stuff looks like butterscotch topping, and will thin with mineral spirits. I took a tank sprayer, and sprayed all areas that were not paint-able. I even made a 4' long extention for a tank sprayer, and inserted it into the frame rails, the bed supports, inside of the doors, the tubes at the top of the outside bed, for the streetside bed, etc, to put a protection on them. When the thinned EECI dries, it leaves a wax like coating on the metal.

I have my bed off, so it is a bit different situation.

[Austin 4x4]

considering my floors are 100% rust free, i think its doing its job just fine. when i cut the rockers the inside wast still clean shiny metal, thanks in part to the galvanised coating. and being a colorado truck its whole life dosn't hurt.

[frank n texas]

Many years ago the first thing a person did upon taking delivery of a new vehicle was to have it undercoated while the underside was still new and clean...

:drivin:

[CJ the noisemaker]

I have undercoating underneath Setsuna...


I also think it flaking off is a feature in itself.
:D

[TexTJ209]

Undercoating? You mean the factory oil leaks that would coat the underside of the Jeep with a layer of oil that stops rust? :p

[jpcoutts]

I used a commercial pressure washer with a kerosene fired burner to clean up a CJ I worked on a while back. Then switched to keroseneon a stiff brush and finally used the purple degreaser to cleanup to nice shiny surfaces.

[kaklask]

Undercoating? You mean the factory oil leaks that would coat the underside of the Jeep with a layer of oil that stops rust? :p
X2:thumbsup: