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Summary: Plastic bags allow airbrushed colors to go on the t-shirt darker. Learn how to use plastic bags on airbrushed t-shirts in this free craft video about how to make an airbrushed shirt.
"This business is a dirty business, you can see my hand's got a lot of paint on it. Teeshirt paint is generally a water-based paint, soap and water will get it off, sometimes it will stay a little bit longer, some colors like the reds and stuff. Remember the paper towel with the wrinkled up, if you've watched all along, how it gives you this thing? Basically, the same concept, you go to get a ziplock bag, maybe your dad's sandwich or your husband or your wife's sandwich is not still in the bag. Same thing, if you want you can stick your hand inside of it, kind of wrinkle it up a little bit. The nice thing about this is that the paper towel soaks in the paint, this don't, and you'll see the difference. See how much darker the paint is? Still basically the same thing, looks very similar, but it makes darker ridges and more, I guess you could say "blobby", back to my English, it's a "gooder" thing to do. It's the same thing, you get a similar look but you get darker edges if you want. Sometimes the paper towel, the paper towel I was using was more of an industrial, it didn't soak up as much as you would if you used the Bounty, or something like that that's on your Mom or Dad's or your husband's counter or whatever, but it's basically the same thing. And you can get the same effect, you could actually just really fill it up with paint to where that's puddled in there, and make it really dark. Move it around, smear it, it's like finger painting, just have fun with it. And you can come back and make an edge on it, then write names in it, whatever. Sometimes when you're doing stuff like this, use a lighter color than the purple. Thank you."
eHow Article: Using Plastic Bags on Airbrushed Shirts