Painting of Keel - Metal

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solent_hazard

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Can anyone recomend a good way to deal with rust on a steel keel, have done the usual grinding and priming several times but the brown always re-apears next year.

The keel is in good condition and I am able to get a good surface
 
This turns up regularly. My lazy solution was to do no more than wire-brush the rust and paint the rusty bits with any old Hammerite before a coat or two of Primocon (or is it Primacon). It worked very well for me.
 
I got the rusty bits off with a grinder and flap-wheel, painted immediately with rust converter (Vactan is good and much cheaper than Kurust - ebay shop sells it) and then two coats of underwater primer then AF as usual. Lasting well but don't expect many years will pass before doing it again.
 
Of limited use to you but this is a good read for 7 quid download -
Metal boat maintenance-A do it yourself guide
http://www.lulu.com/content/2255485
The author has lived aboard a steel yacht cruising and the book is about what he's found works. He goes for phosphoric acid and amershield. A guy here has had good results with phosphoric acid and joton jotomastic(sp?). Both on steel yachts, not just a steel keel. If you find the magic anti rust wand please let me know /forums/images/graemlins/smile.gif
 
Having a steel boat what I did and is generally the accepted method is to dry grit blast and paint with epoxy tar.

The grit blast not only cleans the surface of rust and any grease it also roughens the surface so the epoxy grips better.

Next best is needle gun followed buy wire cup brush on a large angle grinder. Sanding tends to smooth the surface so the epoxy has less to grip onto.

Paint must be applied with in 4 hours as rust starts to develop after that.

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