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painting Galvanised Steel

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Speedy Builder506/07/2018 17:31:55
1978 forum posts
139 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.
BobH

Samsaranda06/07/2018 17:43:36
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905 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
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72 forum posts
5 photos

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

KWIL06/07/2018 19:16:02
3204 forum posts
63 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
459 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.

Maurice

Speedy Builder506/07/2018 20:52:09
1978 forum posts
139 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.
BobH

richardandtracy06/07/2018 22:27:38
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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.

Regards

Richard.

V8Eng06/07/2018 23:28:46
1402 forum posts
27 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.

Regards

Jerry

Chris Evans 607/07/2018 09:11:23
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1624 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
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7468 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
1978 forum posts
139 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.
BobH

Russell Eberhardt07/07/2018 11:13:46
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2573 forum posts
85 photos

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

Russell

Speedy Builder507/07/2018 11:33:04
1978 forum posts
139 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
306 forum posts
1 photos

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

peak407/07/2018 20:39:39
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1075 forum posts
124 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.

Bill

mechman4809/07/2018 10:51:38
avatar
2626 forum posts
407 photos

'Hammerite' .... ?

George.

Speedy Builder509/07/2018 11:55:41
1978 forum posts
139 photos

Hammerite does not 'stick' to galvanising George

pgk pgk09/07/2018 12:00:27
1717 forum posts
287 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**

pgk

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