Has anyone ever had success with specialist rust treatments. In particular the type you can paint over existing rust. This would be for parts like chassis or inside doors where you may not need to over paint them. So far I have tried granville rust converter & por15 metal ready. Any better ideas please.
Yep...cut and weld in new. It's the only solution for any car you want to keep.
All that these "rust remedies" do is delay the problem for a short time. They'll work a little ON ONE SIDE of the problem but as you know, rust comes from the inside out so by the time you see it on the outside of a panel, i'ts already come through from the back. And they don't stop it from spreading outwards or address the source of the problem in the first place.
You are right, I know, but for sections where cut & weld is not worthwhile or you cannot access the problem. Any ideas please, of course I could use the old favourite - used engine oil...
Cut and weld is always worthwhile - it's the only solution. Used Engine oil isn't going to do anything than cover up the problem and can actually accelerate it by trapping in damp.
You'll stop rust by excluding air. Just painting over it doesn't work as rust 'moves' and will cause the paint to crack and let in air. Rust treatments try and get round this by neutralising the rust into a more stable compound. However, for somewhere that doesn't show, a decent wax will keep out air and remain flexible enough not to crack. Dinitrol is a well known and respected brand.
IME it's best to drop the shell into a solution of washing soda, connect the negative croc clip to a sacrificial electrode (say an old bolt or three), and the positive to the shell...
...and believe me I have used nearly everything available over the=20 last 40 years!
That was the original purpose, if you keep reading the tech blurb it=20 describes how it has been found to be an excellent rust cure &=20 preventer. Paint it on (it goes on like water and finds every crevice=20 and microscopic gap and fills it). If the surface goes dry you paint=20 on some more straightaway BEFORE the first coat dries.
See here
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(for=20example)
After 24 hours you can paint and prime as usual - but the paint flows=20 on more smoothly :-)
You can buy it from Dulux paint centres for about =A315 per litre.=20 Sounds expensive but it goes miles.
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