Enamel or ceramic paint for fuel,brake lines?

[ziggy]

My fuel lines nes at the bends are rusted.their 1998 since on the car, but rest of the lines 3 of them still look metal,good. The brake lines similar .mechanic today said Their not rotted,don't recommend replacing them right now
So! At my local advance auto, theirs rustoleum spray paint. One is enamel other ceramic in it for engine block painting withstands up to 600 degrees F. The tech Their did not recommend I spray the lines too protect them..
Why not? If I could , could; use the enamel at least? I park car outside in street so it's exposed too heat cold rain ECT thought I could spray the lines,and brake lines coat prot CT then. Would the ceramic one cause damage?

 

[Trav]

Just a light wire brushing and spray with this, you can then spray either the enamel or ceramic over it.

https://www.walmart.com/ip/Black-Ru...wl13=2118&selectedSellerId=0&wmlspartner=wlpa

https://www.homedepot.com/p/Rust-Ol...658/202623091?source=shoppingads&locale=en-US

 

[BHopkins]

I don't see any practical way to paint brake lines with the coverage and quality of paint job, that would be needed to actually protect them from rust.

Assuming you are going to paint the brake lines while they are in place, on your car, you aren't going to get full coverage, all the way around to the side of the brake line that is close to the car. And once rust starts back there, it is going to propagate, until it gets under the edge of the paint.

Even if you could get full coverage, how would you prep the surface, all away the outside of the brake line, well enough to get good adhesion? For any kind of adhesion that will actually protect the brake line, you are going to have to clean off all existing corrosion, any dirt and oils, so the paint will be adhering to the metal brake line, and not to the dirt, oil, or old corrosion. Without that sort of surface prep, the paint is just going to chip and peel at the first sign of heat or cold or impact from road debris.

 

[Lubener]

For the cost of paint and the effort , it would equal replacement (if you did it yourself) of all those lines you are attempting to protect.

 

[MasterSolenoid]

Living in the 'rust belt', I have always applied GREASE to my brake & fuel lines.
NEVER any rust. NEVER a replacement.
(this was on my 19-year-old Ford Ranger).
Don't worry about a pretty paint job, it's under the vehicle and no one will see it.

 

[AdmiralYoda]

Paint won't help, the damage is done and it will likely just flake off over time even if you used a proper cleaner, wax/grease remover, rusty metal primer and topcoat. Like others have said, it would be cheaper and probably easier to replace them rather than paint.

On the other hand...there are rust preventative coatings that may help. Noxudol 300 is one of the best. It is a waxy anti-corrosive coating that works great as an undercoating to prevent rust. The chemicals in it will actually attack the existing rust and render it inert also.

IMO this is one of the best undercoating chemicals to prevent and stop rust. They also make a lighter, more flow-y cavity wax which is good for frames and doors as it wicks into the nooks and crannies too.

https://www.noxudolusa.com/product/noxudol-300-500ml-aerosol-can/

 

[Gus_Mahn]

I’d brush or spray them with boiled linseed oil. It’ll soak into the rust for a few days then harden to a gummy texture. One the best and easiest way to deal with rust IMO.

 

[TomYoung]

I don’t think painting brake lines makes any sense at all. Also, obscures damage, which you want to be able to see. Replace them if it is time.

 

[Arc]

All it will do is seal in the rust and dirt. I had to take a hard line off yesterday to replace a brake caliper flex hose and the end fitting twisted the line and never did break loose. From now on I'm just going to leave the factory coating and skip painting them.