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 Post subject: Spray Painting Dust Free
PostPosted: 28 Aug 2011, 11:14 
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Joined: 06 Apr 2009, 10:08
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Location: US Pacific Northwest
I hope I didn't fool anyone into thinking I had a solution with this title. ;)

I typically spray paint the metal on my chassis. First with a high quality primer which I then sand glass smooth with 600grit wet dry sandpaper. Then a couple of topcoats of a semigloss enamel. Here is my problem. Invariably on (what I think is) the final coat, regardless of how carefully I have cleaned and let the air settle, I spray the top coat, it looks great, then when I look at it a minute later, it's got small specks of dust in the paint.

Then I have to let it cure, polish it down with the extra fine sandpaper and try again. As an example, my top plate on my Lacewood amp took three attempts before I got a smooth, dust free top coat.

So my question is what do you guys do to get a dust free topcoat when spray painting? Am I better off inside and trying to get my worksop dust free, or am I better off working outside? I don't seem to have this problem when working with wood and wipe on finishes. It's only a problem when spray painting.

Any help or advice people could offer would be greatly appreciated.

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PostPosted: 28 Aug 2011, 19:59 
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I work outside, but in mosquito season it's impossible as the stuff is the best bug attractor on the planet :-\

Cheers!

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PostPosted: 29 Aug 2011, 15:16 
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Joined: 14 Feb 2010, 13:13
Posts: 663
Location: Lisbon, Portugal
I use a small and cheap Igloo tent.

I cutted a small hole on top of it for a small PC fan! :P

I don´t get inside the tent, only my head / arms.

It works well and it is dismantable.


Cheers,

Miguel


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PostPosted: 30 Aug 2011, 03:10 
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Joined: 27 Aug 2011, 14:15
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Location: norway
In my experience dust is more likely to set on a horisontally laid object, so I prefer if possible to hang my stuff so that I can spray them vertically. I also clean the object with a product called a tac-rag. It will remove the fine dust. If possible I use water on the floor, that will bind the dust, stop if from wirvling up, when moving around.

oh... btw please excuse my poor english :)


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PostPosted: 31 Aug 2011, 17:35 
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Location: Duesseldorf, Germany
oiphy wrote:
In my experience dust is more likely to set on a horisontally laid object, so I prefer if possible to hang my stuff so that I can spray them vertically. I also clean the object with a product called a tac-rag. It will remove the fine dust. If possible I use water on the floor, that will bind the dust, stop if from wirvling up, when moving around.
:thumbsup:

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Some of my projects: TDA2050 Chip Amp, the LM3886 Gainclone Thread and the Szekeres Headamp Thread.


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PostPosted: 03 Sep 2011, 16:02 
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Well, working outside worked this time. It was much simpler to get a dust free environment. I just laid two pieces of wood about 3/4" tall on either side of the top plate, spray painted it, then immediately laid a large piece of cardboard across the wood braces. This held the cardboard about 3/4" above the drying paint. Close enough to help prevent settling dust from getting in the paint, but far enough up to allow some air to circulate to allow proper drying.
Attachment:
top_plate.jpg


I love the suggestion about using a small inexpensive pup-tent as a spray booth. I'll need to try this. I also hadn't thought much about hanging pieces vertical. This is also a great suggestion. :up:

Thanks all.


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PostPosted: 03 Sep 2011, 19:51 
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Lookin' good! :up:

Cheers!

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* Ratings are for transistors - tubes have guidelines*
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PostPosted: 10 Oct 2011, 18:40 
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Joined: 07 Feb 2010, 15:42
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Location: England
Have you tried using a hair drier to quick dry the paint?

Obviously don't keep it in one spot constantly, just wave it back and forth as if you were spraying the area, then fine sand it down and lacquer it.

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PostPosted: 10 Oct 2011, 23:06 
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kkkittehz wrote:
Have you tried using a hair drier to quick dry the paint?


That has always been full of FAIL for me :(

Cheers!

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* Ratings are for transistors - tubes have guidelines*
Home: GeeK ZonE
Work: Classic Valve Design


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PostPosted: 04 Nov 2011, 03:12 
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Joined: 17 Aug 2011, 06:05
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Location: Australia
drying acrylic paint - use halogen lights - these work well.
also on non metallic finishes - block back with 2000grit (wet) then apply coats of 'clear' for a high gloss finish.

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