Panel line pre shade PSI

I may be wrong but it sounds to me like even though you have thinned the paint to milk consistency, if you are getting runs, it is because you are putting the paint on too thick and depending on the size of the needle too close. That would fill the panel lines and cover up the shading. You should put it on in very thin coats (dusting). 

I'm no expert, so I would advise you to check in the Painting section where I think they know a lot more than me and can give you more help.

Hope that this helps you.

Jim  

For very thin lines you hafta get in real close like 1 inch. Think of a reversed funnel shape exiting your air brush. When you get in close you're painting with the "neck " of the funnel and not the wider part which is what you want for thin lines.

The closer you get to the subject the LESS pressure you need so the paint doesn't "blow out" of your wanted spray path. Start with 10PSI and experiment from there +  or - 1 or 2 PSI until your thin line performs the way you want it too. with some paints I have used as little as 6PSI in my Badger 105.

Jay Jay

For very thin lines you hafta get in real close like 1 inch. Think of a reversed funnel shape exiting your air brush. When you get in close you're painting with the "neck " of the funnel and not the wider part which is what you want for thin lines.

The closer you get to the subject the LESS pressure you need so the paint doesn't "blow out" of your wanted spray path. Start with 10PSI and experiment from there +  or - 1 or 2 PSI until your thin line performs the way you want it too. with some paints I have used as little as 6PSI in my Badger 105.

 

Awesome! Thank you

 I will give it a go on some scrap before I start my HK models 1/32 B17G.

I use a normal 0.3mm needle and spray only with enamels. I use my standard pressuer for general spraying, not sure what it is but I have found at higher pressure the paint atomizes a little better. I also keep the AB tip about 19mm t0 25mm from the model.

Needless to say it is a double acton AB that I can controll the flow of paint.

Theuns