Context: Areas that should not be soldered may be covered with solder resist (solder mask). One of the most common solder resists used today is called "LPI" (liquid photoimageable solder mask).  A photo-sensitive coating is applied to the surface of the PWB, then exposed to light through the solder mask image film, and finally developed where the unexposed areas are washed away. Dry film solder mask is similar to the dry film used to image the PWB for plating or etching. After being laminated to the PWB surface it is imaged and develop as LPI. Once common but no longer commonly used because of its low accuracy and resolution is to screen print epoxy ink. Solder resist also provides protection from the environment.

Question: If part of a PCB isn't solderable, what can be used instead?
Answer: solder resist

Question: What's another term used for "solder resist"?
Answer: solder mask

Question: What solder resist with a four-word name is a popular choice in the industry?
Answer: liquid photoimageable solder mask

Question: What kind of coating gets applied to the PWB before light exposure?
Answer: photo-sensitive

Question: What solder resist is so inaccurate that few choose it anymore?
Answer: screen print epoxy ink

Question: Areas that should be soldered may be covered with what?
Answer: Unanswerable

Question: A photo-sensitive coating is applied beneath the surface of what?
Answer: Unanswerable

Question: Wet film solder mask is similar to what?
Answer: Unanswerable

Question: Screen print epoxy ink is commonly used why?
Answer: Unanswerable

Question: What doesn't provide protection from the environment?
Answer: Unanswerable