By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Oct 22nd

painting Galvanised Steel

All Topics | Latest Posts

Search for:  in Thread Title in  
Speedy Builder506/07/2018 17:31:55
1820 forum posts
128 photos

I have made a wind vane from some galvanised steel sheet and mild steel rods and tubes etc. I guess that I should use an etch primer, but would an acid etch with sulphuric or phosphoric acid be just as good or better. Not too fussed about the final paint finish, but once installed, don't want to go onto the roof to re-paint it often. I believe you can mix Jenolite into oil paints to make your own etch primer.

Samsaranda06/07/2018 17:43:36
785 forum posts
5 photos

Most good paint suppliers will supply a ready made etch that works on galvanised, I know our local painting suppliers do, doubt whether you will get anything that’s any good in the DIY supermarkets, need a specialist paint supplier.

Dave W

donkey06/07/2018 18:57:06
70 forum posts
5 photos

Cold galvanising paint like " galvafroid". Made for the job

KWIL06/07/2018 19:16:02
3121 forum posts
56 photos

Apart from paint-on hi zinc paints as abocve, you can also get hi-zinc spray on that works very well. I have use this paint on galvanised gate hardware with good long term protection, even where the striker hits the latch.

Maurice06/07/2018 20:18:04
443 forum posts
50 photos

Galvanised steel should be treated with mordant solution. This will turn it black and allow the paint to adhere. Duluth paints make it, as well as other suppliers.


Speedy Builder506/07/2018 20:52:09
1820 forum posts
128 photos

Interesting replies, I have used galvafroid, but it doesn't stick to galvanised steel. Now what is Mordant solution ? 10% Phosphoric acid, a touch of copper carbonate and a flammable "paint" mixed in it. Now I need to find out where and what they call it in France.

Thanks for the info.

richardandtracy06/07/2018 22:27:38
938 forum posts
10 photos

On the farm we let galvanised metal weather bare for 6 months, then the oxidised surface held the paint quite well.



V8Eng06/07/2018 23:28:46
1314 forum posts
28 photos

We always used Galvafroid on galvanised conduit, over twenty five years since I had any involvement with that work though.

Edited By V8Eng on 06/07/2018 23:31:39

Edited By V8Eng on 06/07/2018 23:32:59

Edited By V8Eng on 06/07/2018 23:37:16

Monoman07/07/2018 08:33:49
51 forum posts
7 photos

When proper functional coatings were available calcium plumbate was the 'go to' product.

Please note 'plumbate' indicates llead containing thus classified as Toxic.



Chris Evans 607/07/2018 09:11:23
1478 forum posts

Mordant solution is sometimes called Mordant "T" wash. Depends on where in the country you are. I have painted galvanised Land Rover chassis after using the wash. Sold the last Land Rover now but all the time I kept it the paint stayed on.

Ian S C07/07/2018 10:32:49
7447 forum posts
230 photos

To prepare the iron for painting if it's new, wash it with detergent in hot water to get rid of the oil.

Ian S C

Speedy Builder507/07/2018 10:40:27
1820 forum posts
128 photos

Thanks all - I have found a tin of RUSTOL OWATROL on the shelf. It says its a rust preventative which can be used on zinc. I have used it in the past on rusty iron / steel with excellent results, so hope I don't have to shin up onto the roof to re-paint the weather vane too often.

Russell Eberhardt07/07/2018 11:13:46
2482 forum posts
85 photos

Suitable primer available at branches of Castorama: **LINK**


Speedy Builder507/07/2018 11:33:04
1820 forum posts
128 photos

Well Russell - That seems to fit the bill nicely. Thanks Bob

Monoman07/07/2018 16:09:50
51 forum posts
7 photos

But note the safety warning - Dangereux – Respecter les précautions d’emploi. Dangereux = Dangerous, the highest danger classsification under REACH.

Meunier07/07/2018 16:35:02
247 forum posts
1 photos

"Can cause sleepiness and vertigo" so be especially careful if you paint it up on the roof !

peak407/07/2018 20:39:39
852 forum posts
71 photos

I've tried Galvafroid on various Landrover parts in the past, but not found it very long lasting.

Rustoleum Cold Galv paint seems to work quite well.


mechman4809/07/2018 10:51:38
2461 forum posts
371 photos

'Hammerite' .... ?


Speedy Builder509/07/2018 11:55:41
1820 forum posts
128 photos

Hammerite does not 'stick' to galvanising George

pgk pgk09/07/2018 12:00:27
1455 forum posts
282 photos
Posted by Speedy Builder5 on 09/07/2018 11:55:41:

Hammerite does not 'stick' to galvanising George

I had a look and they do a special metals primer which includes galvanised and also a hammerite direct to galvanised paint **LINK**


All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Support Our Partners
Eccentric July 5 2018
Eccentric Engineering
Meridenne Boat 2019
TRANSWAVE Converters
Allendale Electronics
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest