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Originally Posted by speedphreak
Depends if you have a siphon feed or a gravity feed airbrush. Siphon feed, get the little cups, when your done using one color, take it off, spray till nothing comes out except air...no color, put the next cup on with the new color...repeat..its what I do. If you have a gravity feed, you need to spray thinner between every color. Hope this helps!
-Chris
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You have to flush with thinner between colors regardless of whether you have gravity or siphon feed. All it means when paint stops coming out is that there is no more excess paint in the airbrush, there will still be a residual lining of paint in the chamber though which is why you flush with thinner before the next color. If you haven't ended up with two colors on the model yet through what you're doing, you've just been lucky.
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Originally Posted by skoda_norman
Got a few questions myself.
When spraying your supposed to 'thin' paint down... what do you use as thinner? Sounds silly, but can you use turps/white spirit?
I'm really not sure and don't want to attempt anything till I know what I am doing...
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I certainly don't advice thinning paint with turpentine, use the correct thinner for the paint type, that's why it's important to know what paint you're using, and when possible, get the matching brand of thinners.
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Originally Posted by DukeMan
You could thin acrylics with regular Ajax, Windex or whatever the name if the window cleaner.
I thin laquers with regular thinner, the one found in your average hardware store.
I wouldŽnt recommend you to use enamels, but if you do you could thin them with white spirit or turpentine.
Good luck!
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I've had mixed results using household detergents to thin paints, I just find it a less than certain method when it comes to getting a good paint finish as each brand of paint reacts differently.
I have found ModelMasters and Testors acrylic thin fine with 70% alcohol, while Tamiya paint prefers Tamiya thinner for predictable results.
I agree with you on the lacquer paints.
I don't agree with you using turpentine, while it's great for cleaning paints, it's not a great paint thinner and it makes the paint unpredictable in my opinion.