Touching up aluminium - Ovni

[Tintin]

I've got a few paint chips on my Ovni, down to bare aluminium.

I'm looking for a quick solution that doesn't involve two-pack paints.

Am thinking abrade, degrease, Hammerite special metals primer, followed by Hammerite smooth.

Thoughts?

 

[vyv_cox]

I think that's about the best you can do. I made a radar scanner adaptor in aluminium in 2002 and treated it exactly like that. It remains perfectly good.

 

[Neeves]

Anodising is another answer, I think, but I suspect you are talking of an item rather too big to treat

I made two components, roughly 100mm each side square, from the 7075 alloy and the one I anodised remains perfect the untreated one an interesting disaster. Most rock climbing kit is commonly made from 7075, because it has a high tensile strength, (and anodised).

Anodising is fiddly - I'll try Vyv's recommendation - much more sensible.

Of no use to your problems but ... Interestingly we use an aluminium anchor as our primary. I think the fluke is the welded 5083 alloy (with lead ballast in a welded closed ballast chamber). The shank is 7075 (I know this the 7075 is embossed on the shank) and secured to the fluke with a single stainless bolt. It sits on our bow roller, when not in use (attached to alloy steel shackles and alloy steel chain). We have been using the anchor for over 10 years. No signs of corrosion.

Jonathan

 

[Tintin]

Anodising is another answer, I think, but I suspect you are talking of an item rather too big to treat

I made two components, roughly 100mm each side square, from the 7075 alloy and the one I anodised remains perfect the untreated one an interesting disaster. Most rock climbing kit is commonly made from 7075, because it has a high tensile strength, (and anodised).

Anodising is fiddly - I'll try Vyv's recommendation - much more sensible.

Of no use to your problems but ... Interestingly we use an aluminium anchor as our primary. I think the fluke is the welded 5083 alloy (with lead ballast in a welded closed ballast chamber). The shank is 7075 (I know this the 7075 is embossed on the shank) and secured to the fluke with a single stainless bolt. It sits on our bow roller, when not in use (attached to alloy steel shackles and alloy steel chain). We have been using the anchor for over 10 years. No signs of corrosion.

Jonathan

Err yes, about 13m long

 

[Neeves]

I do know Ovni's - they, and aluminium yachts, are not that accepted here. But, as everyone knows - and having the chance to mention, I've done a lot of work on HT, lower link size - think less weight, and someone who took up the concept owns a Ovni and is one of the owners/directors of one of Australia's better known boat builders. https://www.wrightsons.com.au/.

He installed 100m of galvanised HT chain, 8mm replacing 10mm (but same strength).

Jonathan

 

[Beneteau381]

Anodising is another answer, I think, but I suspect you are talking of an item rather too big to treat

I made two components, roughly 100mm each side square, from the 7075 alloy and the one I anodised remains perfect the untreated one an interesting disaster. Most rock climbing kit is commonly made from 7075, because it has a high tensile strength, (and anodised).

Anodising is fiddly - I'll try Vyv's recommendation - much more sensible.

Of no use to your problems but ... Interestingly we use an aluminium anchor as our primary. I think the fluke is the welded 5083 alloy (with lead ballast in a welded closed ballast chamber). The shank is 7075 (I know this the 7075 is embossed on the shank) and secured to the fluke with a single stainless bolt. It sits on our bow roller, when not in use (attached to alloy steel shackles and alloy steel chain). We have been using the anchor for over 10 years. No signs of corrosion.

Jonathan

Sigh!

 

[Beneteau381]

I do know Ovni's - they, and aluminium yachts, are not that accepted here. But, as everyone knows - and having the chance to mention, I've done a lot of work on HT, lower link size - think less weight, and someone who took up the concept owns a Ovni and is one of the owners/directors of one of Australia's better known boat builders. https://www.wrightsons.com.au/.

He installed 100m of galvanised HT chain, 8mm replacing 10mm (but same strength).

Jonathan

Second sigh and eye roll!

 

[Neeves]

Second sigh and eye roll!

It is a pleasure to see that you and Doug748 both have the time to read my posts and have so much time on your hands you feel the need to comment.

Jonathan

 

[Beneteau381]

 

[Zing]

I've got a few paint chips on my Ovni, down to bare aluminium.

I'm looking for a quick solution that doesn't involve two-pack paints.

Am thinking abrade, degrease, Hammerite special metals primer, followed by Hammerite smooth.

Thoughts?

I thought the best thing about aluminium boats is you don’t need to paint them. Just keep them bare metal?

 

[Binnacle]

There ought to be a prize for the most tenuous thread drift. Perhaps a week's holiday in Australia.

 

[SaltIre]

Of no use to your problems but ... Interestingly we use an aluminium anchor as our primary. I think the fluke is the welded 5083 alloy (with lead ballast in a welded closed ballast chamber). The shank is 7075 (I know this the 7075 is embossed on the shank) and secured to the fluke with a single stainless bolt. It sits on our bow roller, when not in use (attached to alloy steel shackles and alloy steel chain). We have been using the anchor for over 10 years. No signs of corrosion.

Jonathan

I what way, exactly, is drifting a thread discussing painting aluminium to talk about anchors "interesting"?

 

[Neeves]

I what way, exactly, is drifting a thread discussing painting aluminium to talk about anchors "interesting"?

I did not note any drift, it was all about corrosion of aluminium.

It was about the different corrosion of different aluminium alloys - the fact it was on anchoring was irrelevant - but you focussed on the anchoring not the corrosion. Anodising is one way of protecting aluminium but not in this instance.

One day I'll have an answer to the OPs problem having conducted trial on anchoring gear - but according to you I am to not share the future if is has application in anchoring.

I think you are maybe lacking in generosity and lateral thinking.

Its interesting - Mylar was not developed for use in sails (the first big public application was the Gassamer Albatros). Carbon fibre was not developed to enhance sailing. LFRs were not developed to enhance removal of bogged vehicles, climbing rope was retired and sent to land fill now it has another use. Sail drives enjoyed wide spread condemnation on their release. Let's not talk about nylon.

Your life is part enhanced by uses of product designed for total different applications.

Its a good thing some people think laterally, live in an environment where lateral thinking is encouraged and don't worry about the criticism.

Where would we be if the development of the sail drive had been terminated.

Jonathan

 

[Tintin]

I thought the best thing about aluminium boats is you don’t need to paint them. Just keep them bare metal?

Yeah, but this is the topsides that came painted pre-me. At some stage it will need redoing and I may just get it blasted off, except for non slip sections on the deck.