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That's what I'm going to do ... the paintings will be Model Air by Vallejo and I have their own thinner. I'll try 50-60% thinner with low pressure ...maybe 7-10 PSI...Thin your paint more Luis Carlos. It will end up smoother but you will need to do a few trials to get the optimum mix and pressure. Depending on the paint, you might end up with 60 or even 70% thinner.
Will these flow improver drops be the equivalent of a few drops of water with a minimum of liquid detergent for dishes?I use Vallejo Air myself, I have a .035 needle I use and I typically spray at 10-15 PSI, I thin it with their thinner to about 70% paint to 30% thinner and add a couple of drops of flow improver as well. Also try moving the airbrush closer to your work. If I get much more than 5 inches away mine tends to start splattering because the paint is drying before it hits the model.
Very good recommendation John.Looks great Luis! In response to your dilemma, I would say the same thing as Andy... thin your paint more. I have never used Vallejo paints but with Tamiya acrylics, I commonly thin my exterior color mixes to be approximately 4:1 or 3:1 (thinner to paint ratio). This is much thinner than normally recommended but it is a good way to get a very smooth paint finish. One key to using highly thinned paints is to keep the airbrush moving. It's very easy for the thinned paint to pool and run if you pause the airbrush on one spot too long. The other key is to slowly build up your coat of paint using many passes over the same area.