Electric Cat Dude
Needle-chuck Ninja
I still struggle with fine lines on hard surfaces. I own Iwata Hp-C+ 0.2 and I can paint really fine lines on traditional paper, but when surface is not absorbent my fine lines goes splatter. I know about paint reduction and psi reduction. I heard that Micron has better atomisation at low psi. Does the Micron make a significant difference on hard surfaces?
I hate to say it, but it’s either 1) poor trigger control, 2) excessively thinned mediums or 3) a combination of the two.
Depending on what you intend to paint, you might also pre-sand the surface with a fine grit sand paper to give the paint a little bit more adhesion to the workpiece. Hard, smooth surfaces will require a paint with a little bit more stickiness to quickly adhere to the surface without running or being blasted clear by the overspray. The vicious circle of this is that this usually requires a more viscous medium which limits just how fine a line you can spray and invariable requires a higher pressure to draw the medium from the color cup.
You will never achieve as fine a line as you will with water based paints like watercolors and gouaches on an illustration board. It’s just the limitations of the hardware. For automotive paints or enamels, you’re probably going to be very lucky to achieve a 0.7 mm or thinner line on a consistent basis.
You may have to spend a little time doing some trial and error with these techniques to determine empirically what is the best combination for the best results.