Edge Highlighting
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Edge highlighting is the technique most responsible for the sharp, professional look of studio-painted armor. Hard-surfaced objects catch light along their corners and edges, so painting a fine bright line along those edges convinces the eye that the surface is glossy and three-dimensional. It is fiddly, it punishes bad brush control, and it transforms flat panels more than any other single step. If your models look painted but somehow unfinished, missing edges are often the reason.
The setup is more important than talent. Use a brush with a sharp point, not necessarily a tiny one; a size 1 or 0 with a good tip carries more paint and paints longer lines than an ultra-fine 000 that runs dry mid-stroke. Thin the paint to a smooth flowing consistency, load the brush partway, and wipe it so no blob sits at the tip. Brace both hands together, or rest your painting hand against the model-holding hand, so the line comes from finger movement, not a floating arm.
The core stroke is the side of the tip, not the point. Hold the brush so its tip runs along the corner like a train on a rail, letting the edge of the model do the aiming for you. Long, light, single strokes beat repeated dabbing. For a straight panel edge, commit to the full stroke; for a curved edge, rotate the model rather than curving your hand. If a line wobbles onto the flat surface, let it dry and patch with the base color, which is quick and invisible.
Color selection makes edges read as light rather than decoration. Highlight with a brighter, slightly desaturated version of the base: blue armor edges in pale blue-grey, red in orange-pink, green in yellowed green. Pure white edges on colored armor look chalky except as a final sparkle on the sharpest corners. A two-stage approach works well on display models: a broader line of the mid highlight, then a shorter, brighter line only on corners and points where light would truly bite.
Selective placement beats complete coverage. Edging every single line on a model flattens the effect and costs enormous time; light does not hit every edge equally. Prioritize upward-facing and outward-facing edges, the silhouette, and focal areas like shoulder plates, weapon casings, and helmets. Leave downward-facing edges alone or give them the mid tone only. This selective logic reads more naturally, and on an army it cuts the workload per model by half or more without anyone noticing what is missing.
Progress comes fast with deliberate practice. Paint edges on a spare piece of sprue or a junk model for ten minutes before working on something you care about, the same way a guitarist warms up. Check your paint consistency every few minutes, because edge paint drying on the palette turns lines gritty. And accept that shaky lines are normal for months; the patch-and-retry loop is the actual technique, not a failure of it. Every army painter you admire painted thousands of wobbly edges on the way to clean ones.