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How to Spray Photo Resist on PCB

A printed circuit board, or PCB, is a flat board that holds the electronic components in electronic devices such as televisions, remote controls and computers. Electronics manufacturers and hobbyists print custom PCBs that display efficient, space-saving layouts of their circuit designs. Each PCB consists of at least two layers: a plastic or fiberglass surface and a copper plate. The copper plate is coated with photoresist, which hardens the circuit's paths onto the copper plate when the plate is exposed to UV light.

Things You'll Need

Table
Rag
PCB rubber (optional)
Soft sandpaper or scouring pad
Photoresist spray

Instructions

- 1
  Choose a clean, dust-free room. Clean the table where you will be working with a rag to remove dust.
- 2
  Clean the copper side of the PCB with PCB rubber or soft sandpaper until the copper is shiny and free from dust and grease. Alternatively, clean the board using a scouring pad and water. Wait for the board to dry completely.
- 3
  Lay the PCB on the table with the copper side up.
- 4
  Hold the photoresist spray 20 to 30 cm away from the PCB at a 30 to 45 degree angle. Coat the copper evenly with photoresist. If you need a thicker coat, wait for the first layer to dry before spraying a second coat.

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