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Rust


daverclasper
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Hi.

Been wondering this for a while. Rust is caused by oxygen and moisture I understand. then why, if not absolutely removed/neutralized, does it return through a thick coat of paint, which I assumed would prevent the two catalysts entering/reacting.

Cheers, Dave

Edited by daverclasper
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Because any crack in that paint will allow a little bit of air/moisture in and allows the reaction to start - the best way is to paint with a substance that converts the remaining rust into an inert compound and then continue to work once its dried - and be flexible. And have another coat of perhaps something else to make really sure!

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Thanks. Just realised this on wrong section.

Yes, but, paint cracking, would then start rust on sound metal (which I guess happens sometimes).

Could it be something else?.

Wondering, as it's very hard to get rust out of seams, so can it be contained/banished (indefinitely/forever) or even a good few years?. 

Edited by daverclasper
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I like Buzzweld paints- they are basically Corroless pains (Spelling!) - they do what I said before - they have different types for different applications and stuff to spray into cavities. 

But there is also POR15 which is another type of paint doing a similar function. Many are either 2pack or two different types of paint - and under coat and top coat.

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