Rust spots on frame paint

[JimmyXR7]

Under my marauder, the black frame has some rust spots. What treatment have other owners used with success?
I was going to use a wire brush on a drill motor to clean to bare metal.
Is rust encapsulator any good?
Rustoleum primer and paint?
Something better?
Jim

[ctrlraven]

Good question, I've got some spots as well I'd like to take care of.

[Rockettman]

Just remove any loose stuff.
Repaint with a "rust" paint. (Tremclad; etc.)
GET THE CAR OIL SPRAYED! Period!
Nothing will help more in this world to preserve your car, than oil spraying. It works!

[babbage]

Amsoil HD metal protect is what I use. This is better than any paint, keeps the metal oily so it can't rust. Bonus: you can safely spray it everywhere underneath.

Same type of theory as gun oil.

[fastblackmerc]

Use POR15 as a base coat then a good quality paint for a top coat.

[fastblackmerc]

Just remove any loose stuff.
Repaint with a "rust" paint. (Tremclad; etc.)
GET THE CAR OIL SPRAYED! Period!
Nothing will help more in this world to preserve your car, than oil spraying. It works!


Amsoil HD metal protect is what I use. This is better than any paint, keeps the metal oily so it can't rust. Bonus: you can safely spray it everywhere underneath.

Same type of theory as gun oil.

Undercarriage has to get dirty as all get out.....

[MOTOWN]

I would use POR15 as well, that stuff is bullet proof! and dont get it on your hands!

[babbage]

Undercarriage has to get dirty as all get out.....

Not really bad it's kind of a dryish waxy like suface, my under carriage is pretty good. Not like 03MMonroe, but it's protected. Even my rear axle has no rust on it as I spray that too. All metal linkages, parking brake springs, cable assy, nuts shock mounts everywhere you really wouldn't want to paint. Rust free.


I would use POR15 as well, that stuff is bullet proof! and dont get it on your hands!

I have heard this too, for the frame this would be good too. Have never used it. Prep it good, which scares me to sand the factory frame paint off.

[babbage]

This is it.

http://www.amsoil.com/storefront/amh.aspx

http://www.amsoil.com/StoreFront/images/amh_can_300pxh.jpg

AMSOIL Metal Protector (http://www.amsoil.com/StoreFront/amp.aspx) (MP) and AMSOIL Heavy Duty Metal Protector (MPHD) are easy-to-use spray-on synthetic products that protect metal surfaces, displace water and silence squeaks. MP cuts through rust and corrosion to restore free movement of “frozen” hardware parts. MPHD lubricates metal surfaces, leaving a dry waxlike film. Neither forms gum or sludge.
AMSOIL MP is the product of choice for drying electrical and ignition systems and protecting electrical equipment from freshwater and saltwater damage. AMSOIL MP is also the product of choice for protecting firearms and other fine componentry. It contains no silicone. AMSOIL MP is compatible with plastic, leather, fabric, fishing line and paint.
AMSOIL MPHD is the product of choice for metal surfaces that require a heavy duty lubricant or are exposed to the damaging effects of salt, moisture or chemical corrosion. It is ideal for hinges, wire ropes and springs, nuts and bolts, motorcycle or bicycle chains, and for undercoating,wheelwells and other metal surfaces exposed to water, dirt or road salt.
Performance Features


Protects against rust & corrosion, even in salt water
Displaces water
Stops squeaks
Lubricates metal surfaces
Leaves a dry, long-lasting, waxlike film
Lubricant does not attract dust
Does not sling off
Sprays into hard-to-reach places
Ideal for chains & other heavy-use items

RECOMMENDATIONS
Spray product on area to be treated. For best results, do not wipe off. Film carrier will evaporate, leaving MPHD on treated surface.

[montyd]

I'd use por 15 as well, its nice because it doesn't have to be sprayed.

[Accumulator]

Under my marauder, the black frame has some rust spots. What treatment have other owners used with success?
I was going to use a wire brush on a drill motor to clean to bare metal.
Is rust encapsulator any good?
Rustoleum primer and paint?
Something better?
Jim

Eastwood's Rust Encapsulator *is* very good stuff, I like it better than POR-15. It's not all that particular with regard to prep either (unlike the POR-15). Two coats are better than just one, but that's not absolutely necessary unless things are pretty bad.

You could paint over the Rust Encapsulator if you want (even though it's a decent matte black all by itself and holds up fine uncoated), but if you
are gonna topcoat it, it's happiest if you topcoat with enamel rather than lacquer-based stuff.

Or you could use Eastwood's Black Heavy Duty Anti-Rust. It's basically just a black undercoating but it penetrates surface rust, dries pretty hard and "clean" (more like a paint than WaxOyl/"Ziebart"-type suff), and stays on. I've done pretty nasty/rusty undercarriages with it and it held up great for years. You can get it in spray bombs if you don't want to bother with an undercoating gun. Since it dries like a paint, it's less likely to trap moisture/etc. than regular undercoatings if you do an imperfect job.

OR..if you're into overkill, use Rust Encapsulator on the existing rust and then do it all with the Black HD Anti-Rust.

IME RustBullet is even better than the Rust Encapsulator, but it's silver and it's more of a hassle to use (for one thing, you gotta, and I mean *gotta* use at least two coats).

The Amsoil HD Metal Protector is also great stuff, but I only use it for applications where having a nice black finish isn't called for (e.g., parking brake cables, spare-wheel mounting hardware on trucks, etc.). Great for bare metal parts that you can't/won't paint.

[Baaad GN]

After it's all painted and shinny what wax do you use then?

[ImpalaSlayer]

rust bullet is better then POR15. both require a top coat though.

[Accumulator]

After it's all painted and shinny what wax do you use then?

If you're really gonna wax the undercarriage you need to use something that's withstand the kind of frequent, aggressive cleaning needed to keep it nice.

I'd either use one of the new coatings (e.g., OptiCoat) or, for a more conventional approach, FinishKare FK1000P. Much easier, but less durable, would be Collinite 845 Insulator Wax.

On garage-queens, this "wax the underneath" works fine. On drivers I usually just spray the undercarriage down with a "leaves stuff behind" quick-detailer like AutoInt/ValuGard's Fast Finish and give it a quick wipe. But you have to redo that after each time you wash it, which, to keep it nice, means after every time you wash the car.