Painting method for clean lines - GIF

Painting method for clean lines.

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Previously:

Plate painting machine - GIF
Restoring a Rembrandt painting - GIF
Road painting arrow technique - GIF
Spray painting a huge ship - GIF
Wall painting machine - GIF

So - you use the first paint on the line to seal the paint edge and then you paint over that sealed edge to be the final color. It probably needs to have paint colors that don't bleed and mostly first coat cover.