Member -Signman replied:

If you use a rust converter- ensure the residue is totally washed and cleaned off before applying anything over it...

Member - Mike DID replied:

The cold-galvanising ONLY works if it's in direct contact with the steel.

To be effective you must coat the cold-gal with a primer designed to go on bare metal (which the zinc is) or bituminous paint.

Our gutter stays wet for long periods due to leaf litter collecting in it and a few patches had started to rust because the zinc had worn away. I wire-brushed to bright steel, painted with cold-galvanising, then painted with bituminous paint. Ten years later that gutter is still going strong !

Moose replied:

Just keep travelling and the stone blasting keeps the rust at bay:-)

Member - bungarra (WA) replied:

Galmet make a product that is a rust converter.

You then use another Galmet product that paints over that skin the rust converter created. To the layman afterwards it looks as though it was coated with coldgalv.

We use it in sheds with a high corrosive atmosphere and just finished doing so to some trusses. So far it seems an excellent product.

Member - Kiwi Kia replied:

Rust has roots. It can tunnel in a little as well as along the surface. Thats one of the reasons a modern rust converter is worth while as it kills and then encapsulates the rust all in one coat. I use a Turgo product called Black Guard, goes on white, gets a bluish tinge then drys black - hard as !

Trekkie (Member - WA) replied:

I have found that often the red dust gets ito all the nooks and crannies and looks like there is more rust than actually exists. I have used Ranex for years without any detriment. When applied it almost makes things look like new. I always dilute it quite a bit. I have used a spray bottle or small paint brush and when the rust has disappeared I use my hi pressure cleaner to remove all the surplus.

Check it on the Internet - You can get it at Bunnings

RANEX RUSTBUSTER
Description:

Ranex Rustbuster converts rust from a detrimental oxide to a phosphate of iron, thus prolonging the life of the metal and paint.

Features & Benefits:

•Penetrates deep to convert and chemically destroy rust
•Removes surface rust, cleans and brightend polished surfaces
•Removes ugly rust and bore water stains
•Cleans boats, polishes stainless steel fittings

Sizes:

250ml, 500ml, 1L, 4L, 20L

Download Datasheet:

DS Ranex Rustbuster (76 kb)