I tried looking but maybe not good enough. Im trying to figure out what is the best kind of rust remover to use under my truck. Im planning on undercoating the whole truck with in the next 2 months. And does anybody know what the best undercoating? I want something that will also keep the rust from coming back.

 

POR15 or Eastwood Rust Encapsulator
Eastwood claims fewer steps with the Encapsulator over the POR15.
Have POR15 on my Indy frame

 

Based on my experience, I would never use undercoating on rust even if you clean it. Moisture fines its way through and will rust underneath the undercoating. What I am doing to my frame is I am knocking all the loose rust (very little) and clean it with degreaser, then I paint it black with Rust-Oleum paint. Its a task doing it but its holding real well and I haven't had a problem with flaking.

 

I've met and talked with a lot of people in the VW hobby over the years who have reported problems with POR 15. Even a restoration magazine I subscribe to had issue with spraying it according to the manufacturer's instructions and had to modify the mixture. A test of it against Rust Encapsulator showed Rust Bullet to be superior in durability and adhesion.

I've heard from a lot of people that Rust Bullet is another easier and better product. Hammerite paint is yet another I've heard that stands up to abuse, plus it comes in many colors.

 

I spray phosphoric acid on rust. It will eventually eat it away then I paint it. You can get a gallon jug of it from any home depot but do not inhale or get it on your skin.

From Wiki

"
Phosphoric acid may be used as a "rust converter", by direct application to rusted iron, steel tools, or surfaces. The phosphoric acid converts reddish-brown iron(III) oxide (rust) to black ferric phosphate, FePO4.
"Rust converter" is sometimes a greenish liquid suitable for dipping (in the same sort of acid bath as is used for pickling metal), but it is more often formulated as a gel, commonly called naval jelly. It is sometimes sold under other names, such as "rust remover" or "rust killer". As a thick gel, it may be applied to sloping, vertical, or even overhead surfaces.
After treatment, the black ferric-phosphate coating can be scrubbed off, leaving a fresh metal surface. Multiple applications of phosphoric acid may be required to remove all rust. The black phosphate coating can also be left in place, where it will provide moderate further corrosion resistance. (Such protection is also provided by the superficially similar Parkerizing and blued electrochemical conversion coating processes.)"

 

POR 15 is magic, we did it to my buddies 1976 F250. didnt sand the rust off or anything, just slapped it on there and its way better than any paint ive seen. its hard as a rock

 

What about Naval Jelly? Anyone ever used it?