I have heard the best kind is with phosphoric acid to prevent rust from coming back, but what kind do you use.

Is this applied with a brush, spray on? etc.

thanks


eight

I have used RUST MORT from my local auto paint supply store. I had surface rust on the roof of my Charger due to the standard crappy vinyl top. It was painted in 2003. No rust peeking through yet. Then again it was primed with epoxy primer, high build primer, sealer, 3 coats of paint and 4 coats of clear.

we sell chassis saver at my parts store. it works great. brush or spray it on. lays out like glass. can get it in gloss black, satin black, or aluminum. $35 a quart.

This seems to be an issue as old as time.

Two schools of thought here.

One. Never use a rust inhibitor. paint can eventually lift.

Two. Many people use it with success.

I follow school one. I never use rust inhibitor.

I epoxy prime all bare sanded metal.

been using "ospho" on mine

doing the body work and removing surface rust on the cab roof

I wipe it on with a rag

follow directions on the bottle

There are "rust removers", "rust inhibitors" and "paint".

The removers are the one's that leave the phosphorous coatings. Great for rusty parts that you will paint afterwards. My best success has been soaking parts and brushing occasionally till all the rust is gone. The problem with spraying or brushing it on is that it will usually evaporate before the job is done on anything but very light surface rust.

The inhibitors are products that "convert" the rust into a rock-hard substance. This stuff is good where you know the rust exists but you can't easily access it to remove it (like inside panels or frame rails) or where the final appearance doesn't matter (under carpet). The stuff can be painted afterwards but its not usually necesssary.

Everything else is pretty much an "encapsulator" paint, with additives that will inhibit the rust. These are your "Rust Bullet","Zero Rust", "POR15", "Chassis Saver", "Rustoleum", etc.

Whenever possible I prefer the removers ... get rid of it first then take steps to prevent its return.