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01-18-2008, 02:53 PM | #1 | |
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Paint to Thinner Ratio @ what PSI
Hey guys,
So i got my new airbrush and i am looking to get going on using it. What have most found to be the best mix for Tamiya paints and thinner and spraying at what PSI? |
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01-18-2008, 03:44 PM | #2 | ||
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Re: Paint to Thinner Ratio @ what PSI
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01-18-2008, 07:49 PM | #3 | |
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Re: Paint to Thinner Ratio @ what PSI
Here are the real world rules of thumbs I paint by:
-Paint with the lowest pressure possible. Reduce the pressure until just before the airbrush stops spraying smoothly- thats the pressure you want to spray at. -Use as much thinner/reducer as you can before the paint runs/pools. Thin it until just before it pools (and spray it on in light mist coats to avoid pooling)- this is the amount of thinner you want to use. These can be judged only by test spraying- you MUST test spray. There are far to many variables in airbrushing (ambient temperature, humidity, operator skill, phase of the moon, etc) to expect that thinning by a ratio will work. You must find your own pressure and your own level of thinning by testing and experience. ...and that pressure will probably be between 20 and 30 psi for Tamiya acrylics, and you might have decent luck with oneish part thinner to twoish parts paint. Or so. But test it (always test it) and find out for yourself.
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01-18-2008, 08:56 PM | #4 | |
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Re: Paint to Thinner Ratio @ what PSI
Ive only been airbrushing Tamiya paints for a very short time. Before that, I used almost exclusively Model Master enamels.
Ive been using 91% Isopropyl Alcohol to thin my Tamiya paints. Some people agree w/ this, and others vehemently disagree w/ it. So far Ive had good results w/ it, so until I have otherwise, thats what I'll continue to use. I started by mixing them 50/50 w/ the Alcohol, and had very inconsistent results. Sometimes would have great results, other times had nothing but trouble. A very good friend of mine is the owner of the local hobby shop. I was talking to him a few weeks ago about the problems I was having w/ painting my current project (Tamiya Ducati 916). I was trying to airbrush a couple metallic colors, and it just wasnt going well at all. Spitting, very rough texture, etc. I had been thinning it 50% w/ the 91% Iso. He told me, that w/ acrylics, that you want to thin them as little as possible, and still have it thin enough to go through the airbrush. He suggested 70/30 or 75/25, paint to thinner. I went back, and thinned it about 70/30, wasnt extremely precise on it, and it sprayed a lot better. So it really all comes down to trial & error, like mentioned before. |
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01-18-2008, 09:34 PM | #5 | ||
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Re: Paint to Thinner Ratio @ what PSI
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Thinning acrylics with water/alcohol is very popular with military aircraft and armor modelers, and honestly it works fine- as long as you're goal is a flat 'military' finish. But it performs poorly if you're using gloss colors. Here, your much better off using the manufacturer's thinner. Yes, it's more expensive- but honestly, isn't a nice finish on your parts worth the $0.12 that the proper thinner would cost? Obviously you don't have to clean up with Tamiya thinner afterwards, but try it for thinning the paint. You'll be amazed at the difference it makes.
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01-18-2008, 10:46 PM | #6 | |
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Re: Paint to Thinner Ratio @ what PSI
so basically, if I'm using decanted Tamiya spray paints, then thin it with Tamiya thinners? What about MCW automotive paints? I just had a problem with my brand new airbrush spitting, and before I started painting, I completely broke it down and cleaned it.
I am using Nason thinner for all of my paints right now and I have had some problems! any suggestions? |
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01-19-2008, 12:54 AM | #7 | |
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Re: Paint to Thinner Ratio @ what PSI
THe next time I get to my LHS Im going to go ahead & try the tamiya thinner. Is it possible to get it in anything larger than the 1/3 oz container? Thats all my LHS has it in.
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01-19-2008, 08:13 AM | #8 | ||||
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Re: Paint to Thinner Ratio @ what PSI
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The little 1/3oz bottles are really rather silly. I go through an 8oz bottle in a year or two. They can be found pretty easily online, but your LHS should be able to order larger sizes for you. You may have to give them the specific stock number for the 8oz (if they're lazy), but that's easy enough to find online, too. Quote:
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Ask MCW what their recommended thinner is, and find some.
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01-19-2008, 09:16 AM | #9 | |
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Re: Paint to Thinner Ratio @ what PSI
I had no idea that the thinner we use really makes that much of difference! Thanks for the great advice MPWR. I ordered some Tamiya laquer thinner online and will call MCW to see what they say!
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01-19-2008, 10:40 AM | #10 | |
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Re: Paint to Thinner Ratio @ what PSI
Thanks MPWR. I figured there were larger containers, but I dont think my LHS has anything but the 1/3 oz bottles. The Tamiya site lists it for 7.50 a bottle, which isnt nearly as expensive as I expected it to be, so I'll have my LHS order me a bottle.
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01-19-2008, 10:40 AM | #11 | ||
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Re: Paint to Thinner Ratio @ what PSI
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It's possible to get good results sometimes with stuff other than what the manufacturer recommends (and some people really get a kick out of using the cheapest possible thinner that can be made to work )- but don't mess with other stuff until you've tried the manufacturer's intended thinner for a while first. That way, you will know how the paint is really supposed to behave ideally, and you have that base of comparison to judge the paint's performance if you're messing with other formulations.
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01-19-2008, 12:22 PM | #12 | |
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Re: Paint to Thinner Ratio @ what PSI
Well, went to my LHS, and as I expected, they only had the 1/3 oz bottles. So I had them order me the big 250 ml bottle.
Its no comparison. 2 bucks for the 1/3 oz (10 ml I htink) and should be around 8 dollars for the 250 ml bottle. Might go ahead & order one off the net, but probably take about the same time to get it as my LHS to get it. |
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01-19-2008, 12:38 PM | #13 | |
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Re: Paint to Thinner Ratio @ what PSI
After reading the great advice from MPWR, I ordered two bottles from tamiya.com
your right, no comparison! i can't wait to get it and get spraying! |
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01-19-2008, 01:51 PM | #14 | |
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Re: Paint to Thinner Ratio @ what PSI
Well, I think Im going to wait & let my LHS order it, that way I dont have to worry about shipping. W/ shipping it looks like it'll cost me about 12-14 dollars, but if I wait for my LHS then it shoudlnt be more than 8.
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01-19-2008, 10:50 PM | #15 | |||
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Re: Paint to Thinner Ratio @ what PSI
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Spitting is usually caused by insufficiently thinned paint. Quote:
Sounds like you might be using the reducer intended for their urethanes. It's potent stuff! I avoid it for health reasons. Unless you're painting 1:1 cars, you won't lose any of the benefits of automotive paint if you thin it with hardware store lacquer thinner. And it's a lot safer to handle. Ddms |
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