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Old 19th March 2008, 11:04 AM   #1
spooney is offline spooney  United States
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Default Painting an amps heatsink?

Will painting an amps hetsink drastically alter its heat dissipation capability?
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Old 19th March 2008, 02:19 PM   #2
Clipped is offline Clipped  Thailand
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about 35%, the hardest part about painting it is getting it smooth...use the wrong paint and it will feel sandy to the touch.

if you can find a 'shiny' type of primer, they work the best.

how about sand blasting it? then polishing... the top of the fins would be shiny and inside the fins would be a flat finish...two tone, thatll be pretty cool.

one time i took an amp to a machine shop and had them mill the fins like a wave.
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Old 19th March 2008, 02:39 PM   #3
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Here is a link that may be of interest:

http://sound.westhost.com/heatsinks.htm#15

In short, black anodized coating is best, but if you have to paint, do it with a thin layer of enamel paint.

Regards,
David
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Old 19th March 2008, 02:42 PM   #4
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I just painted a huge heatsink a few days ago. I used one coat of grey Rust-Oleum "automobile primer" and then one generous coat of silver Rust-Oleum "hammered" finish. It turned out better than I expected.

This amp is being changed from class AB to class D so I'm not too concerned about any dissipation loss.

http://i27.tinypic.com/14sfaxf.jpg
http://i29.tinypic.com/2u9pptt.jpg
http://i28.tinypic.com/9jemf4.jpg
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Old 19th March 2008, 04:07 PM   #5
jol50 is offline jol50  United States
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If it is flat black and you need to use paint, try the bumper coat black. Stuff works really well and you can vary the texture and shine some. I have done some end plates and bottom covers that looked great. I sanded with 600 before paint. Should not have to use primer with it if careful, I'd recommend you go thin as possible with any kind of paint and strip it bare as possible if a heatsink.
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Old 20th March 2008, 01:51 PM   #6
Flyin11 is offline Flyin11  United States
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What about the outside cover of a amp? If you painted that, would it be harder to get rid of heat?
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Old 20th March 2008, 02:21 PM   #7
jol50 is offline jol50  United States
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Outside cover? The heatsink being painted is kind of like putting another blanket on your bed, for example. If the part does not dissipate heat it likely will not matter.
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Old 20th March 2008, 03:39 PM   #8
Flyin11 is offline Flyin11  United States
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Yeah...outside like say for example, one of the MRP Alpine amps, a MRP-M450 or MRP-M650...The outside is black with the silver strips on it...What if you took the silver strips off and painted the black a different color....Wondering if that would make a difference....
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Old 20th March 2008, 04:10 PM   #9
jol50 is offline jol50  United States
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Default mrp

The whole thing is the sink, but IMO I think it would not matter that much on one of those if it was installed with good air flow. If the aluminum is still bare and you make the paint on the rest a little thicker I doubt it would change it that much. It would depend on how it is used/installed much more I would think. Also class D amps tend to make less heat than AB amps to start with. The M450 is pretty small though, it may get warmer not sure.
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