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Old 25-05-2019, 21:29   #1
er9
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anodize or powdercoat hatch?

looking at a hard to find vent hatch for my boat on ebay. it looks to be in sound shape except the exterior finish is a mess. its selling at a great price due to its condition that would make it worth refinishing.

its solid aluminum so i was thinking sandblasting then either anodize or powdercoat but im not sure which holds up better in the marine environment long term. also is one cost prohibitive over the other?

the hatch is selling for $68. Its $700 new and id be willing to spend an additional $200 or so having it re-finished.

i considered just spray painting but my spray painting results of previous items are beyond sad.
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Old 25-05-2019, 22:57   #2
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Re: anodize or powdercoat hatch?

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Originally Posted by er9 View Post
looking at a hard to find vent hatch for my boat on ebay. it looks to be in sound shape except the exterior finish is a mess. its selling at a great price due to its condition that would make it worth refinishing.

its solid aluminum so i was thinking sandblasting then either anodize or powdercoat but im not sure which holds up better in the marine environment long term. also is one cost prohibitive over the other?

the hatch is selling for $68. Its $700 new and id be willing to spend an additional $200 or so having it re-finished.

i considered just spray painting but my spray painting results of previous items are beyond sad.
Hi, if it's a long term boat anodize, if not then powdercoat.
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Old 26-05-2019, 08:19   #3
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Re: anodize or powdercoat hatch?

well wouldn't you guess right after i read your reply i hopped on over to ebay and to my sad shock someone bought the hatch.....however.....there was a nicer hatch the same size that was anodized all for $150

sometimes you just get lucky
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Old 26-05-2019, 11:59   #4
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anodize or powdercoat hatch?

By all means anodize, even if you powder coat over it.
The powder coat doesnít fail, itís that the aluminum under it corrodes, that bubbles up and the powder coat falls off.
Anodizing it keeps it from corroding.
Last boat I welded up a Radar mount and had it anodized and then powder coated, it lasted fine.
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Old 26-05-2019, 17:49   #5
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Re: anodize or powdercoat hatch?

good to know...thanks
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Old 26-05-2019, 20:45   #6
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Re: anodize or powdercoat hatch?

There is also a product called Nyalic for future reference. Ideal coating for bare aluminium.
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Old 27-05-2019, 05:35   #7
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Re: anodize or powdercoat hatch?

As a64pilot notes, you can powder coat over anodized aluminum.

However, some anodized surfaces do not work well with powder, because they have inorganic dyes or other issues that make the surface incompatible with powder*.
In most cases for new anodized aluminum, a light sanding of the surface and acetone wipe will suffice.
However, older anodized aluminum will most likely need abrasive blasting. You can then powder coat to color, put in the oven for curing, then put in service.

* I’ve read the suggestion to perform routine wet adhesion testing, as described in AAMA 2604 (8.4.1.3) and 2605 for anodized surfaces.
The surface is cross-hatched and subjected to boiling demineralized water for 20 minutes. After removal, a tape pull test can be used to confirm adhesion.
If this test is successful, the part should be good.
If it consistently fails, the anodizing process is not compatible with powder. If it fails periodically, the anodizing process needs more precise control, or the coater needs a better pretreatment process.

“How to Decide Between Anodizing, Painting, and Powder Coating”
Choosing the right coating for your Aluminum ➥ https://www.saf.com/how-to-specify/h...owder-coating/
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Old 27-05-2019, 09:30   #8
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Re: anodize or powdercoat hatch?

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There is also a product called Nyalic for future reference. Ideal coating for bare aluminium.
that looks like interesting stuff. ordering a can of it to play with. i need to read more about it but i wonder if it might be good for protecting some electrical connections like a negative conection to a cast iron engine?
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Old 27-05-2019, 09:34   #9
er9
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Re: anodize or powdercoat hatch?

Quote:
Originally Posted by GordMay View Post
As a64pilot notes, you can powder coat over anodized aluminum.

However, some anodized surfaces do not work well with powder, because they have inorganic dyes or other issues that make the surface incompatible with powder*.
In most cases for new anodized aluminum, a light sanding of the surface and acetone wipe will suffice.
However, older anodized aluminum will most likely need abrasive blasting. You can then powder coat to color, put in the oven for curing, then put in service.

* Iíve read the suggestion to perform routine wet adhesion testing, as described in AAMA 2604 (8.4.1.3) and 2605 for anodized surfaces.
The surface is cross-hatched and subjected to boiling demineralized water for 20 minutes. After removal, a tape pull test can be used to confirm adhesion.
If this test is successful, the part should be good.
If it consistently fails, the anodizing process is not compatible with powder. If it fails periodically, the anodizing process needs more precise control, or the coater needs a better pretreatment process.

ďHow to Decide Between Anodizing, Painting, and Powder CoatingĒ
Choosing the right coating for your Aluminum ➥ https://www.saf.com/how-to-specify/h...owder-coating/
wow good stuff. this summer i want to take off old hatches and have them re-finished. i will definately have them sandblasted first. its not that expensive to do.
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