Do you have to thin paints?October 12 2017 at 10:50 PM
|Rob (Login bamboo1)|
from IP address 188.8.131.52
I'm getting away with Tamiya paints and no thinning. Testors is more difficult, can't find a good ratio.
For spraying or brushing? nt
|October 12 2017, 11:08 PM |
After decades of study, it has become obvious that Murphy was an optimist...
Re: Do you have to thin paints?
|October 12 2017, 11:13 PM |
You don't need to thin paint but depending on what you're happy with in most cases if you want to do a good job of applying it you do whether you're airbrushing or hand brushing. It all depends on the viscosity of the paint to begin with, some may spray or brush fine out of the bottle, other not so much.
Yes you do
|October 13 2017, 1:25 AM |
You might be "getting away" without thinning Tamiya paints, but they will airbrush so much better if you thin them. Plus you'll make your paint last longer. You should read Gregg Cooper's third article on Hyperscale about painting the Tamiya J1N1 Gekko if you want to learn more about the properties of thinned Tamiya acrylics. There's a lot of nuance to be gained in the look and finish of your model if you thin Tamiya acrylics properly. My feeling is, if you just shoot straight color through your airbrush, you're just going to get straight color.
There are three parts to the Cooper Gekko build article and I think they have been the most helpful tutorials for me as a modeler of WWII aircraft. Don't shy away from thinning paints. Practice on a scrap model until you find the right ratios that suit what you want your model to look like.
Why would you not thin?
|October 13 2017, 8:25 AM |
Thinning allows greater control, gives a smoother finish, preserves detail better and uses less paint.
I've only ever airbrushed Testors and Floquil so I can't speak for
|October 13 2017, 8:57 AM |
Tamiya or others. That being said, I can tell you that I've never relied on ratios to thin my Testors/Model Master paints. I have no clue how many drops of thinner I use to thin "X" number of drops of paint. What I can tell you, however, is that I just go by sight. The first thing I aim for is a roughly half and half mixture (ok...I guess I do use ratios) of paint to thinner. I add the thinner to my airbrush cup first, then pour in the paint. I'll stir it well with a scrap piece of sprue and then touch the sprue to the inner side of the airbrush cup. If the thinned paint runs down the side with the consistency of 2% milk (or skim milk for you health nuts out there), then that tells me it's thinned properly and I'm good to go. Of course, I test it on a scrap model or a paper towel first just to be sure before I commit to the real thing.
Get too much puddling when I thin Tamiya and Testors
|October 13 2017, 10:23 AM |
I have to move fast to avoid puddling.
More info needed
|October 13 2017, 10:40 AM |
Rob, what type of airbrush are you using? It sounds like you have the needle opened up too much or are holding the airbrush too close to cause puddling. Your air pressure may be too low.
Tamiya acrylics thin wonderfully with 91% alcohol and spray very easily when mixed at about a 1 part paint to 1 part alcohol. You can use Tamiya thinner, but I find it sprays just as well with alcohol (do not recommend using denatured alcohol, it dries too fast). With a dual action airbrush, you can get hairlines all the way up to a pattern of 1/2" or so. Make sure the airbrush is CLEAN!
Enamels thin best with the manufacturer's thinner or you can use mineral spirits, Naptha or Xylene to thin paints for airbrushing fine lines. Lacquer thinner works for general spraying but will cause a lot of tip dry when you try to paint fine lines and will drive you crazy. Enamels generally need to be thinned about 2 parts paint to 1 part thinner (mineral spirits, Naptha or Xylene) or 1 part paint to 1 part lacquer thinner for general spraying. These are general thinning ratios to get you started, but your mileage may vary. As others have suggested, practice on a paint mule before painting a good model. Practice makes perfect. You get better at painting by painting. Don't be afraid. Just practice, practice, practice.
|October 13 2017, 11:37 AM |
Yeah, I hold it too close because I don't get results farther away. I thin about 1/4 to 1/3 thinner for Testors. I can't spray at full pressure, I get puddling. I've watched videos, etc.
|This message has been edited by bamboo1 from IP address 184.108.40.206 on Oct 13, 2017 11:40 AM|
The puddling thing is kinda odd. When I hear that, the first couple of things
|October 13 2017, 11:43 AM |
I think about are either the airbrush is being held too close to the model or the airbrush is being moved too slowly. Either way, too much paint is reaching the model all at once. Better to apply light coats and build them up than to firehose everything all in one shot. I'm not saying YOU'RE doing that, but that's what happens to me when I hold the AB too close or move it too slowly. At that point, it's not so much the paint, but rather the technique.
I hold it too close
|October 13 2017, 7:49 PM |
Sounds like your PSI is way too high.
|October 13 2017, 11:50 AM |
For any modeling paints, Testors, Floquil, Tamiya, Vallejo, 15-20 psi indicated static on the regulator should hit within the ball park.
Otherwise another possibility is a damaged fluid nozzle. If it's cracked you could be blowing a lot of excess paint. If it's the .5mm configuration it could be a significant flow of paint.
I don't have a variable compressor
|October 13 2017, 1:21 PM |
I have a Badger compressor. Where can I get a variable compressor? I've looked all around for one.
|This message has been edited by bamboo1 from IP address 220.127.116.11 on Oct 13, 2017 1:23 PM|
What you need is a pressure regulator for your compressor. . .
|October 13 2017, 2:46 PM |
I have one of these, never figured out how to adjust it.
|October 13 2017, 7:48 PM |
|This message has been edited by bamboo1 from IP address 18.104.22.168 on Oct 13, 2017 7:59 PM|
Michael McMurtrey, Proud IPMS Low-# Thumper
Simple. Turn the top knob to adjust the pressure going to the airbrush.
|October 14 2017, 1:33 PM |
The pressure should be set while the airbrush trigger is depressed. The best pressure will vary based on type of paint and how much it is thinned. Some experimentation will probably be necessary. I spray thinned enamels and typically use a pressure of 10-12 psi.
If ignorance is bliss, there's a lot of blissful people out there!
|October 14 2017, 5:57 AM |
Better to take off and deep six the gauge and replace it with one that reads up to a maximum of about 40psi, otherwise it's near impossible to set the pressure at a repeatable level from session to session. A new gauge cost me about A$15 and was well worth the money
Re: Get too much puddling when I thin Tamiya and Testors
|October 13 2017, 12:38 PM |
You're applying too much paint, you may not get full coverage in one coat.