Homebrew PCBs

jcarlosmor wrote:
> Since Vacrel is a dry film soldermask it gives a professional look, but 
> several two-part liquid photoimageable soldermask are also very good. 
> \ufffdwhat kind or brand of LPI did you purchase? The main disadvantage with 
> LPI is the high energy required for imaging, in comparison with dry 
> film.


The 780 H Series LPI solder mask its made by http://www.eternal.com.tw
Data sheet (not available online) states 350~450mJ/cm^2 exposure energy.
Comparing to my dry film photoresist of 60~100mJ/cm^2.
So yea, exposure energy requirement is factor 5 over the photoresist. 
Not a problem, I can handle a 5 minute wait per side.
Have you used LPI before ?