The needle cap is used in technical aerosol painting for effects and detail work. This tutorial shows how to modify it into a custom skinny cap. If left unmodified it produces a strong flow of paint suitable for bursts of color as well as drip effects, basically a splatter cap. Experimentation with custom tips is the key to understanding how to atomize the paint in different ways.
miniature safety pin (smallest possible)
needle cap (either hooded or normal)
Step 1: Shape the tip
1. Hold the cap at its edge furthest away from the straw. Don’t allow the cap to slip into the fire when smelting its edge.
2. Flick the bic lighter and hold the flame for a few seconds. Make sure you are not in a cold location because the metal guard on the lighter will not get hot enough.
3. Place the straw of the needle cap approximately 2/16 inch from flame. Don't let the straw enter the flame. Allow the plastic to soften for about 3-4 seconds.
4. Let go of the button on the lighter releasing the flame. Immediately take the soft part of the straw and press it flat against the warm metal guard of the lighter. Do not press too hard, just enough to lightly seal the plastic. The seal should be a very thin layer that closes it shut.