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Filtering Paint

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  • Member since
    August, 2015
  • From: Hamptonville, NC
Filtering Paint
Posted by TarheelRick on Monday, September 02, 2019 4:42 PM
Just tried to spray some acrylic paints and every few passes I would have to stop and tear my airbrush apart and clean it.  Now i am a bit slow and it took me four times doing this before I finally decided there may be something wrong with the paint.  I had thinned it to three drops off the stir stick, skim milk viscosity.  Used my jig-saw shaker and stirred it with a coffee stirrer for at least a minute.  When I poured it out of the airbrush bottle, at the bottom it appeared as if it has curdled and was quite lumpy.  AHA, the cause of my airbrush jams!  Now my question is how do you all filter your paint to prevent such catastrophes?  I bought some of those filters like you use for house paint, but I cannot get my paint mixture to properly drain through.  Any and all suggestions will be appreciated.

I build models because I can't afford the real thing!

  • Member since
    December, 2003
  • From: Nova Scotia
Posted by Bainford on Tuesday, September 03, 2019 6:49 AM

Good question. I'm interested to know this myself.

Just a thought, though. Did you use a thinner that is compatible with the paint? ...or a thinner that you normally use and know? I'm just wondering if there was a reaction between the paint and thinner that caused some coagulation of the paint. I have had that happen when experimenting with thinners for acrylic paint.

Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away.
       - Antoine de Saint-Exepury

Trevor

  • Member since
    January, 2005
  • From: Canberra, Australia
Posted by aussiemuscle308 on Wednesday, September 04, 2019 3:24 AM
it sounds like the paint had a bad reaction to the thinner. it happens. if you want to filter paint, i'd suggest a gauze metal filter. https://i.ebayimg.com/images/g/K1gAAOSwivNbOtEU/s-l1600.jpg

My Flickr: https://www.flickr.com/photos/87459383@N07/albums

  • Member since
    December, 2003
  • From: Nova Scotia
Posted by Bainford on Wednesday, September 04, 2019 6:56 AM

I noticed on the other forum that you were shooting craft paint. I bought some cheap craft paint at Michael's called Craft Smart to use on an interior. It was my first try at shooting craft acrylics, so I experimented with my usual acrylic thinners; rubbing alcohol or Tamiya acrylic thinner. Both were miserable to shoot, with clogging airbrush,  lots of spatter and blobs, and very poor coverage. Before throwing in the towel I tried water, and the stuff sprayed very smooth.

It might be worth a try. It might also be worth adding a small drop of mild dish detergent, or perhaps a small percentage of the windshield washer fluid to alter surface tension, though I did not try this.

Perfection is achieved not when there is nothing more to add, but when there is nothing left to take away.
       - Antoine de Saint-Exepury

Trevor

  • Member since
    August, 2015
  • From: Hamptonville, NC
Posted by TarheelRick on Wednesday, September 04, 2019 11:27 AM

Thanks for the ideas.  I have used water in the past, but it just didn't seem to adhere very well, that is why I changed to 91% alcohol or Windex.  May have to go back that way and hope the spray on clear will hold it together.

I build models because I can't afford the real thing!

  • Member since
    November, 2013
Posted by Daddy_O on Tuesday, September 10, 2019 7:38 AM

This was on FB. Guy swore by it.

I haven't tried it yet but bought the glycerin to do it.

Glycerin used in acrylic paints as a retarder to keep it from drying as it leaves the gun.

Math it out to get smaller mix.

1 cup rubbing alcohol
4 cups water
1 cup glass cleaner
5 drops glycerin
This will make you 48 Oz of reducer.
G'luck!
  • Member since
    August, 2005
  • From: Nashua, New Hampshire
Posted by mrmike on Tuesday, September 10, 2019 8:46 AM

I try to use like-branded products together.  Model Master Acryl Thinner with Model Master Acryl paint.  Tamiya thinner with Tamiya paint.  For enamel and lacquer hobby paint, I like to use Klean Strip Lacquer Thinner from Home Depot and I thin the paint to a milk-like consistancy.  I have never had an issue with paint flowing my airbrushes.  I have always stirred my paint in the jar before thinning it for my airbrush  

"That's Spenser with an 'S' like the poet."

Robert Urich Spenser For Hire 1985

On my bench-'67 Foose Dodge Coronet; 1969 Ford Mustang Boss 302

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