1. The quality of liquid photosensitive solder resist ink is very excellent, suitable for the manufacture of high-end electronic products, the price is moderate. 2. It is recommended to use KSM-S6188, which is a two-component, screen-printed high-precision alkaline liquid imaging solder resist ink for double-sided and multi-layer printed circuit boards for precision circuits. The flatness is good, and the post-cured coating film has excellent adhesion, chemical resistance and heat resistance.