How to Spray Photo-resist on PCB

Written by larry simmons
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How to Spray Photo-resist on PCB
Rear shot of a completed PCB board. ( Images)

A Printed Circuit Board (PCB) is the base upon which modern electronics sits. It contains the pathways for electronic components from transistors to chips, all connected to the PCB and uses the PCB to communicate. Because the pathways on PCBS are so small, they're often photo-etched in place through the exposure of the copper plate of the PCB to light. In order to make this exposure possible however, you must first spray the PCB with a photoresist spray. This spray prepares the copper for light exposure, making it possible to transfer complicated patterns from film onto the copper to create the paths that your components use for communicating.

Skill level:

Things you need

  • Copper plate
  • Fine-grit sandpaper
  • Photo-resist UV spray

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  1. 1

    Clean the copper plate that you're using for the PCB with a fine-grit sandpaper. Run the sandpaper over the plate for two to four passes to remove all dirt, dust or grease from the surface. Do not touch the cleaned plate as your skin's natural oils can interfere with the creation of the PCB.

  2. 2

    Hold the bottle of photoresist spray at a 45-degree angle, about 10 inches from and pointed towards the copper plate.

  3. 3

    Spray the copper plate with the photoresist, using a gentle swinging motion, going back and forth over the plate and working your way from the top of the plate to the bottom.

  4. 4

    Wait five minutes after spraying the first side, and then turn the plate over and repeat the application process for the photoresist spray, if you intend to create a two-sided PCB.

  5. 5

    Place the sprayed plates into a dark dust-free location for drying. Allow the plate to sit for a full day to ensure complete drying of the material.

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