Hammerite on alloy?

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nelly1

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I've got a Seldon electric in mast furling system. The casing is starting to corrode under the paint finish in places.
I was thinking of rubbing down and de-greasing, and then using hammerite.
Has anyone used Hammerite on alloy on the exterior of a boat, does it stand up to the salty atmostphere?

Any recommendations greatfully recieved
 
I painted my alloy spreaders with black smooth hammerite about 2 years ago. I cleaned them very well and primed with Hammerite Special Metals Primer - it seems to have worked very well indeed.
 
Not a great fan of Hammerite .. and nor were our paint technologists.

There is a special Hammerite primer for use on aluminium. If you use the Hammerite use the primer but clean off all the oxide to bare metal whatever you use.
 
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Yes, more good experience with the Hammerite primer. I mounted my Raymarine radar scanner on a Scanstrut pole intended for something else, so made up an adaptor plate in aluminium. I painted it with the primer, then a few coats of white Hammerite smooth. That was about nine years ago and it still looks fine.

With the leftover primer I painted the galvanised roller doors on my workshop, then overcoated with Dulux. Good adhesion, no flaking or loss years down the line.
 
For a start, don't bother with Hammerite of any variety, a triumph of marketing over capability.

There is a paint I'd recommend, but I don't have a tin handy to check if it's suitable for alloy.

If it is, I very highly recommend Dulux Metalshield Pro'. It needs the primer of the same name and by lucky coincidence is silver.

I have used this on my mild steel keel for the last 2 seasons and it is way better than any other treatment ( yes I'd have laughed at anything with Dulux in the name too but this is rather different ).

I have tried EVERY steel treatment going at any price - I used to work in a chandlery and am a qualified engineer so am familiar with most of what's available, and this is a league ahead of the rest.

As I say it needs checking that it's suitable for alloy, if it is, look no further; either way you can do much better than Hammerite, and will almost certainly need a primer to suit.
 
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DavidTav said:
I painted my alloy spreaders with black smooth hammerite about 2 years ago. I cleaned them very well and primed with Hammerite Special Metals Primer - it seems to have worked very well indeed.
Click to expand...

Yes same here - I refurbished an alloy clamp on my outboard mount and that has held up very well for 3 years out in the weather on the push pit.
 
Both the main and mizzen masts on my boat came in an 'orrible lime green colour which had to go. The foot of the main was badly bubbled where it had been grinding on the tabernacle with various areas of exposed alloy through chaff.
After cleaning off the oxide I treated with alum, degreased and gave the exposed bits two coats of Hammerite non-feric primer, then two coats of smooth silver Hammerite.
So far so good after a full season.
Time will tell.
 
I used to be a Hammerite fan, but recent experience shows that something has changed in the paint.
I had to use an angle grinder and radial wire brush to strip the inside of a Mini I was restoring 9 years ago.
My boat trailer I painted 5 years ago went rusty and the water actually brought the paint off.
Another poster says
That was about nine years ago and it still looks fine.
Click to expand...
So I am supposing that the formula changed about 5/7 years ago.
 
Lakesailor said:
I used to be a Hammerite fan, but recent experience shows that something has changed in the paint.
.......
So I am supposing that the formula changed about 5/7 years ago.
Click to expand...

It certainly has changed and I think it may have changed more than once
I remember when the old paint was suddenly no longer compatible with the new thinners, but that must have been nearer 20 years ago than 5 or 7.

I have a suspicion that it has changed again more recently.
 
Seajet said:
For a start, don't bother with Hammerite of any variety, a triumph of marketing over capability.

There is a paint I'd recommend, but I don't have a tin handy to check if it's suitable for alloy.

If it is, I very highly recommend Dulux Metalshield Pro'. It needs the primer of the same name and by lucky coincidence is silver.

I have used this on my mild steel keel for the last 2 seasons and it is way better than any other treatment ( yes I'd have laughed at anything with Dulux in the name too but this is rather different ).

I have tried EVERY steel treatment going at any price - I used to work in a chandlery and am a qualified engineer so am familiar with most of what's available, and this is a league ahead of the rest.

As I say it needs checking that it's suitable for alloy, if it is, look no further; either way you can do much better than Hammerite, and will almost certainly need a primer to suit.
Click to expand...
Zinc Phosphate primer and it's good for aluminium alloys.

Excellent stuff - International do a white version which I've used with some success.

Incidentally ICI Paints also own Hammerite (which I must confess I've found very disappointing when I've used it).
 
Thanks for advice, will give dulex a go. Out of interest Hammerite tech dept said their product not suitable..
 
One day I will get round to making my own Hammerite. It cant be difficult. I suspect that it is ordinary paint with a large amount of silicone in it as when we would spray a car and someone had used a silicone polish the paint would give the mottled effect that you get with hammerite. Bit like making your own Swarfega, its only Fairy Liquid with a similar amount of paraffin.
 
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