Hot vs Cold Galv

dag019 · Nov 3, 2021

I am looking to replace my bulkhead with a galvanised one. I have a replacment bulkhead which has been cold galvanised which I picked up very cheaply a couple of year ago. It has not been repaired to the best standard and I have always previously used hot dip glavanised. I do not consider cold galvanising as "properly" galvnaised. All of the information on the differences I can find online are all about the application process and if a piece is suitable for the hot dip process (warping etc) but cannot find any information on the end result differences. Is this view justified or is there no difference between hot vs cold in terms of longevity and protection?

Can anyone recommend a good supplier of galvanized bulkheads? There are a couple of company's advertising on ebay for refub versions has any one used these?
All of the new ones I can see online seem to be shielder who had a terrible reputation when they first started have these improved at all?
I used classic bulkheads in midlands for my series and would use them again for the 110 but their lead time is currently nearly 12months which unfortunately is not feasible at this point.

Turboman · Nov 3, 2021

dag019 said:
I am looking to replace my bulkhead with a galvanised one. I have a replacment bulkhead which has been cold galvanised which I picked up very cheaply a couple of year ago. It has not been repaired to the best standard and I have always previously used hot dip glavanised. I do not consider cold galvanising as "properly" galvnaised. All of the information on the differences I can find online are all about the application process and if a piece is suitable for the hot dip process (warping etc) but cannot find any information on the end result differences. Is this view justified or is there no difference between hot vs cold in terms of longevity and protection?

Can anyone recommend a good supplier of galvanized bulkheads? There are a couple of company's advertising on ebay for refub versions has any one used these?
All of the new ones I can see online seem to be shielder who had a terrible reputation when they first started have these improved at all?
I used classic bulkheads in midlands for my series and would use them again for the 110 but their lead time is currently nearly 12months which unfortunately is not feasible at this point.

Hot dipping is undoubtedly better. But cold, which is really painting with zinc rich primer, can be OK.
Like all coatings, the preparation is 90% of the job, and the quality of the paint is the other 10%.

If you are going to do cold, make sure the metal is mechanically and chemically clean. Remove all traces of rust, ideally with a needle gun, and then wipe off very thoroughly with thinners. Several times, changing the cloth often.

The apply a quality zinc rich primer. If you are paying less than about 50 quid a litre, it isn't going to be any good.

But if you factor in the cost of the paint, the thinners, and the hours of prep, it isn't going to be much cheaper than sending it off for hot dip anyway.

dag019 · Nov 3, 2021

Turboman said:
Hot dipping is undoubtedly better. But cold, which is really painting with zinc rich primer, can be OK.
Like all coatings, the preparation is 90% of the job, and the quality of the paint is the other 10%.

If you are going to do cold, make sure the metal is mechanically and chemically clean. Remove all traces of rust, ideally with a needle gun, and then wipe off very thoroughly with thinners. Several times, changing the cloth often.

The apply a quality zinc rich primer. If you are paying less than about 50 quid a litre, it isn't going to be any good.

But if you factor in the cost of the paint, the thinners, and the hours of prep, it isn't going to be much cheaper than sending it off for hot dip anyway.

I am not looking to do either at this point, I am looking to buy one ready done. I already have one that is cold galv (guessing by the look electro plated rather than sprayed), the question is weather I should go to all the effort to paint and fit, or if I should buy a hot dip one and only have to do the job once?

Turboman · Nov 3, 2021

dag019 said:
I am not looking to do either at this point, I am looking to buy one ready done. I already have one that is cold galv (guessing by the look electro plated rather than sprayed), the question is weather I should go to all the effort to paint and fit, or if I should buy a hot dip one and only have to do the job once?

I have never had anything to do with electro plating, but judging from how long zinc plated fastenings last, it is not great.
Spraying likewise, I just use a brush, I get pretty good application like that.

I would go with the hot dipped one if possible, but in your first post you commented that there was no availability for a year, hence my comments on cold.

Tim4x4 · Nov 3, 2021

Hot galvanized is a better product the component dipped in hot molten zinc it will flow to all areas inside and outside of the component.
Cold galvanized is really painted with zinc rich paint held together with binders so this ability to flow inside is very limited if you just have an outside like a solid bar very little difference in performance. If both quality products and they are applied correctly.
Tim

tottot · Nov 3, 2021

Cold galv is handy stuff if you need to do a weld repair on something galvanised that has been damaged and that's about it.

Tim4x4 · Nov 3, 2021

tottot said:
Cold galv is handy stuff if you need to do a weld repair on something galvanised that has been damaged and that's about it.

Yes that's correct but some things are not suitable to be hot galvanized.
Tim

Hot vs Cold Galv

dag019

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Turboman

Mab An Gov

dag019

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Turboman

Mab An Gov

Tim4x4

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tottot

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Tim4x4

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