Bicycle Mechanics - corrossion on rear brake cable guide

How do you stop corrosion on an alloy frame at the stops for the rear cable guide which are welded onto the bottom of the top tube? It's not just that they get a bit of sweat there...it's the steel (stainless?) cable ends that go over the cable outer. I think I've tried plastic cable ends, but they were not the correct size, and just split anyway under the compression force of the brake cable.

What to do? Gotta get those steel cable ends and steel cable outers away from the alloy frame, but how? More paint, different paint?

Try "NoAlox" , a messy grease electrical contractors use to reduce Al corrosion,
assuming the problem is with the AL side, not the steel side. Teflon pipe tape
wrapped around the cable end would reduce cathodic contact, though sweat
would counter this. A combo of any grease and teflon tape might be better.
Steve

Rear brakes are highly over-rated, lose the cables, problem solved ;)

Thanks for the tips, but it's not quite the solution I was looking for. I think the ultimate solution would be heavily plastic coated/dipped steel cable ends. That would put a solid non-conducting barrier between the two metals...and the would not distort or wear through in one point, thanks to the strength of the steel behind it. I'm surprised someone dosn't already make them.

Might try to coat some cable ends myself with paint, or something thicker and harder.

If you want to coat them use that rubber handle dip. You should be able to get it at a hardware store. It is pretty thick so the fit may be tight.

I think I'll have to go pester a hardware or auto parts store and see what's available...I already have teflon thread tape, but that is certainly very soft material. Also don't want to make a bigger mess by trapping sweat and moisture in there. The grease is starting to sound pretty quick and effective.

Might ask a marine dealer too. It's only a small cosmetic problem ATM, but I've seen them turn into a real mess that you can't fix.