Cleaning Up Stainless Props

JamesTT

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Any tips on how to get my stainless prop set shiny again?

I tried brick acid/cleaner last year that wasn't very succesful.
 
I haven't tried this yet to varify it but I heard that household de-scaler, the stuff used to remove lime is good.

Normally, I use 400 grit wet and dry paper and this works well. It is tough cutting through the limescale / shell lining you get, hence next year, I will try the de-scaler first to soften the stuff!

CD
 
I use Starbrite hull cleaner - it has dilute Hydrochloric (I think) acid in it, and that takes everything off a treat. I then use very fine sandpaper to expose a new surface, otherwise the prop has a slight tendency to rust. (I can't remember the rationale for this, but there is some science behind it somewhere /forums/images/graemlins/smile.gif).
 
For years I've used kettle-descaler in boiling water. Takes a few hours soaking, but generally does the job.

This year I thought I'd try something different, so I spent £9.99 on this set of attachments from Screwfix.

p1029853_x.jpg


Job took about half an hour for two props and they're now as shiney as two very shiney things indeed.
 
Hydrochloric acid removes the chromium oxide layer on the surface which is what prevents stainless steel rusting - hence the rust you've seen. By abrading the surface afterwards, you expose a fresh surface which oxidises immediately.

An alternative is sulphamic acid (Carlton's kettle descaler) which takes longer but doesn't destroy the oxide layer.
 
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