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PostPosted: Fri Jul 14, 2017 8:54 pm 
Devout Dirtbag

Joined: Mon Sep 19, 2016 8:06 pm
Posts: 113
Finally got to my project that started here: viewtopic.php?f=1&t=363061

I had the '96 Marin Nail Trail frame sandblasted - or I should say media-blasted to get rid of the anodized layer and some of the chips and nicks. Now the frame looks very raw - like sparkly whitish gray kind of porous raw. It would take a ton of work to polish it and don't think it's worth the time.

So the question is - can a clear coat like VHT be put over freshly sandblasted aluminum? No primer, no paint. It should definitely stick, I'm more concerned about durability and actually turning smooth.


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PostPosted: Sat Jul 15, 2017 1:44 pm 
Gold Trader / PoTM Winner / RB Rider
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Joined: Fri Jul 23, 2010 4:13 pm
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Location: Royal Forest of Dean (Still looking for the Bear !)
Personally I go with a clear powder coat

It's far more Durable

Cheaper than a clear coat done with Two pack

Yeti did it on their factory frames


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PostPosted: Mon Jul 17, 2017 9:18 pm 
Devout Dirtbag

Joined: Mon Sep 19, 2016 8:06 pm
Posts: 113
Where I'm at in the US, clear powder coat (stage 1 - one layer) costs about $65. 3 cans of VHT Clear Coat costs about $40. Not a big difference I know, but it's something I want to do myself, so I'll give it a try. I think I should be able to put about 4 coats total.


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PostPosted: Tue Jul 18, 2017 8:54 am 
Retro Guru
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Location: Zwolle, Netherlands
I'd go for paint, powdercoat will get dull over time, paint will keep its gloss and is easy to polish if needed.


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PostPosted: Tue Jul 18, 2017 2:32 pm 
BoTM Winner
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Joined: Sun Jun 23, 2013 3:12 pm
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Location: Southernmost US
npn wrote:
Where I'm at in the US, clear powder coat (stage 1 - one layer) costs about $65. 3 cans of VHT Clear Coat costs about $40. Not a big difference I know, but it's something I want to do myself, so I'll give it a try. I think I should be able to put about 4 coats total.


Do yourself a huge favor and call this guy first. Oliver use to work for Spectrum Powderworks before they sold off their bike arm and was the master in my opinion. He's just getting going and may be able to offer you a good price here in the US.

http://www.darkmatterfinishing.com/about


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PostPosted: Tue Jul 18, 2017 3:28 pm 
King of the Skip Monkeys
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Joined: Wed Nov 07, 2007 4:34 pm
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Location: Moomin Valley
I doubt if your frame was ever anodised after seeing the pictures. Lacquer, clear coat, what ever you like to call it, was more common.

Aluminium oxidises quicker than you can type so whatever you use, it will eventually bubble and start to peel.

See if anyone does ball burnishing - that gives a finish that can last for years.


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PostPosted: Tue Jul 18, 2017 3:35 pm 
BoTM Winner
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Location: Southernmost US
Just saw the frame. Agree...I doubt it was anodized either.


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PostPosted: Tue Jul 18, 2017 3:49 pm 
Devout Dirtbag

Joined: Mon Sep 19, 2016 8:06 pm
Posts: 113
I didn't realize the original picture was gone, so here I repost it. It looks very shiny so you guys might be right:

Image


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 Post subject: Re:
PostPosted: Thu Jul 20, 2017 3:11 pm 
Devout Dirtbag

Joined: Mon Sep 19, 2016 8:06 pm
Posts: 113
This is how the frame looks like after it was sand/media blasted. My plan is to apply the clear coat straight on.

Image


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PostPosted: Thu Jul 20, 2017 8:18 pm 
King of the Skip Monkeys
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Joined: Wed Nov 07, 2007 4:34 pm
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Location: Moomin Valley
I'd leave that as it is. Any coating now would start peeling very quickly. powder coat might hang around a bit longer.


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