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 Post subject: Help with Computer Case Painting
PostPosted: Wed Jul 14, 2010 5:49 pm 
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I am going to paint my case but I don't really know how to do it.
This is how I am planning to do it. Tell me if I am right or wrong.

1. Sand grit with 320 Grit.
2. Apply thin layer of primer. Clean with cloth.
3.Wet sand with 600 grit
4. Add another coat of primer.
5.Wet sand with 600 Grit
6. Apply thin layer of color.
7. Wet sand with 600 grit.


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 Post subject:
PostPosted: Wed Jul 14, 2010 8:47 pm 
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Wet sanding is really only necessary if you want a perfectly glossy finish. It's a lot of work. Honestly, I'm usually too lazy to wet-sand my projects, but I always get great satin finishes by just sanding the primer down with some 3M ultrafine sandpaper that you can find at just about any hardware store. It's like a thin sponge with a rough side. You can get the primer down to an impressively smooth state by just sanding with that. Additionally, a clear-coat to finish it off is wise. I usually just use Krylon rattle-can Satin clear coat (for a glossy finish you want glossy clear-coat obviously). The clear-coat makes the finish look better and it protects the paint job against dings and scratches.


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PostPosted: Thu Jul 15, 2010 8:45 am 
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I agree with Spartacus on the 3M ultrafine sandpaper sponge thing. I bought one about a year ago, and have used it on 3 projects so far and it's still usable.


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 Post subject:
PostPosted: Thu Jul 15, 2010 5:36 pm 
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Spartacus wrote:
Wet sanding is really only necessary if you want a perfectly glossy finish. It's a lot of work. Honestly, I'm usually too lazy to wet-sand my projects, but I always get great satin finishes by just sanding the primer down with some 3M ultrafine sandpaper that you can find at just about any hardware store. It's like a thin sponge with a rough side. You can get the primer down to an impressively smooth state by just sanding with that. Additionally, a clear-coat to finish it off is wise. I usually just use Krylon rattle-can Satin clear coat (for a glossy finish you want glossy clear-coat obviously). The clear-coat makes the finish look better and it protects the paint job against dings and scratches.


What type of grit is the sponge though cause I went to the store and I saw more than one type of grits for the sponges that your telling me.


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PostPosted: Thu Jul 15, 2010 6:22 pm 
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The wording on mine says "3X 150 fine grit". I don't think the 150 is a standard grit count though, its a heck of a lot finer than a 150 grit. I can tell you its about 6 by 9 inches and about a 1/4 inch thick, and its red. Hope this helps.


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 Post subject:
PostPosted: Thu Jul 15, 2010 6:35 pm 
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Yes it does. I just finished sanding with both 220 and 320 Grit Sandpaper. Im going to put primer tomorrow cause it's night right now and I want to see what I'm painting so I wont mess up. How many coats of primer do I apply though and how long between each coat or can i just apply primer like 2 times like going up down then side to side.


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PostPosted: Thu Jul 15, 2010 6:50 pm 
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Well, it depends what primer you are using. Standard all-color spray primer benefits from more than 2 coats, but if you're using automotive primer or dark primer, 2 coats is more than enough.


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PostPosted: Thu Jul 15, 2010 6:50 pm 
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Usually 2-3 coats of primer is okay, and you should only have to wait a few minutes between coats, check the instructions on the can since this can vary between brands. You should always apply in a side to side motion, starting from the top of the piece, and work toward the bottom (although some go from bottom to top, I dont think its a big deal either way) and slightly overlap each pass.

Here a pretty good painting tutorial- http://case-mods.linear1.org/case-mod-101-how-to-paint-your-computer-case-part-1/ Its a two parter, theres a link to the second part when you get to the end. Good luck, and be sure to show us pics! :D


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PostPosted: Thu Jul 15, 2010 7:00 pm 
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Very good link. I found it extremely helpful! Oh and I forgot to mention... my case has two stickers, but I can't find a way how to remove them. Should I add primer w/ the stickers on.


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 Post subject:
PostPosted: Thu Jul 15, 2010 7:41 pm 
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No, definitely not. Those stickers will show through the paint job for all eternity. Try using a paint scraper to scrape them off and then get the goo off with some goo gone.


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 Post subject:
PostPosted: Thu Jul 15, 2010 7:50 pm 
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Spartacus wrote:
No, definitely not. Those stickers will show through the paint job for all eternity. Try using a paint scraper to scrape them off and then get the goo off with some goo gone.


Thanks for your help. I removed the stickers already with some alcohol.


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 Post subject:
PostPosted: Fri Jul 16, 2010 5:38 am 
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Spartacus wrote:
No, definitely not. Those stickers will show through the paint job for all eternity. Try using a paint scraper to scrape them off and then get the goo off with some goo gone.


I forgot to remove one sticker and I already added a coat of primer! This sucks! I can't believe I didn't see it.


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 Post subject:
PostPosted: Sat Jul 17, 2010 3:29 pm 
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Here are some pics before i even did anything to my pc.

Image

Image

Image

Here is with first two coats of primer!

Image

Image

Image


Do you guys wanna see how it looks like with one coat of gloss black? Or should I just show you when I apply the second color coat?


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 Post subject:
PostPosted: Sat Jul 17, 2010 8:16 pm 
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Sure lets see moar pics :twisted: Looks like its going well for you man, good luck with it.


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 Post subject:
PostPosted: Sun Jul 18, 2010 7:57 am 
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Here are some more pics after my first color coat.

Image

Image

Image

As you can see it's still a work in progress. Barely today i am going to apply the second color coat. Do I have to wetsand/sand the first color coat then apply the next?


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 Post subject: Update Pics.
PostPosted: Mon Jul 19, 2010 7:37 am 
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This is my computer case with the second color coat applied.

Image

Image

Image

It's looking better :D Tell me what you guys think about it? I'm not done yet though.


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 Post subject:
PostPosted: Mon Jul 19, 2010 10:45 am 
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Yes, it's recommended that you wetsand between coats to get rid of overspray n debris, before moving forward.


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 Post subject:
PostPosted: Mon Jul 19, 2010 4:28 pm 
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PM_DMNKLR wrote:
Yes, it's recommended that you wet sand between coats to get rid of overspray n debris, before moving forward.


OK thanks. Tomorrow I will be applying Clear Gloss. I'm going to wet sand with 600 b4 adding clear. Then ill let it dry for 30min. Can I wet sand then apply rubbing compound in the same day?


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 Post subject:
PostPosted: Mon Jul 19, 2010 7:58 pm 
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Yes, u just need to make sure u give the clearcoat a couple days to cure b4 wetsanding.


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 Post subject:
PostPosted: Tue Jul 20, 2010 7:13 am 
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Would two days be good enough for the clear coat to cure?


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