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Protecting mild steel

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BOB BLACKSHAW17/08/2019 10:05:46
262 forum posts
59 photos

I've finished a grasshopper engine and need to rust protect the mild steel parts, I don't want to paint it as I don't get good results with this.

I'm thinking of heating the parts and dipping in oil, or any other suggestions please.


Thor17/08/2019 15:07:01
1157 forum posts
33 photos

Heating and dipping in oil can give a nice black finish. I usually use linseed oil on a small piece of cloth, heat the part and apply the oil until I get the finish I want. In my experience this will give some rust protection, especially if you wipe a bit of oil onto the parts occasionally.


Bill Chugg17/08/2019 15:29:35
965 forum posts
6 photos

I used metalguard on mine as advised by Jason.

This means the original steel finish is retained.


duncan webster17/08/2019 15:34:04
2331 forum posts
34 photos

Glass/plastic case with a bag of desiccant inside, keeps the dust off as well

Ian S C18/08/2019 12:33:09
7467 forum posts
230 photos

Very little paint used on my hot air motors that are stored in my uninsulated workshop, rarely is there ever a problem with rust. I haven't, but I have heard of aerosol hair spray being used as a rust preventitve, it's not hard wearing, but OK on items that are not handled much.

Ian S C

mechman4818/08/2019 12:42:07
2549 forum posts
385 photos

… 'I have heard of aerosol hair spray being used as a rust preventive' …

Used this myself over the years, nowadays I use clear lacquer spray available from any DIY/Hardware/ motor shops, hard wearing as it's made for car paintwork coating.


Paul Lousick18/08/2019 13:38:18
1282 forum posts
512 photos

Lanonin is a good surface protector for polished metal parts of an engine if you want to keep the shiny silver finish.


J Hancock18/08/2019 14:07:45
335 forum posts

From tests carried out in ME from long ago, ' Three-in-one' oil was way ahead of anything else.

Phil H118/08/2019 14:21:13
205 forum posts
33 photos

I have just removed the tarnish off a small steam engine and coated the parts in metalguard as Bill has done. One of steel parts is flame blued for a nice contrast.

I quite like bare or blued steels. A huge number of sins can be covered up with filler and paint.

Phil H

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