Do not move contaminated materials over the substrates or coating equipment.
To avoid this, always keep the waste steams away from contamination streamlines.
Do not move your hands over the coating area or substrates.
Instead, organize your work space so that you are reaching over equipment as little as possible.
Avoid holding pipettes directly over substrates in a vertical laminar flow hood, as dust can fall from your gloves or pipette onto your substrate.
Instead, hold the pipette at a slight angle.
Do not put gloved hands over the substrates as you move them into the spin coater.
Close the lid gently before spin coating.
With these tips, you can create an uncontaminated film in a vertical laminar flow hood.