Step 3 of the PCE Process

The material is coated with photo resist directly after cleaning which reduces the chance of surface contamination and oxidation. The coating is photosensitive and resistant to the etchant used to cut the chosen metal.  Dry film or liquid resist is applied to both sides of the work piece to allow etching for both sides simultaneously.

Advances in resist technology combined with new and improved Computer Assisted Design (CAD) artwork have enabled photo-resist coatings to accommodate extremely complex features.