Homebrew PCBs

Hello all been a long time since i posted really enjoy learning from 
you all. A few years back when I wrote magazine articles for hobby 
contruction I had to supply pc boards some of which I made myself. 
I used a negative resist like kpr. I had a negative exposure frame 
with a sheet of window glass and used a piece of small bubble wrap 
above the film to apply even presure on the coated board and film. 
some times it would not wash off clean with a thin film of resist 
remaining. I was exposing with sunlight long story short the heat 
from the sun or (sunlamp was tried also) fogging the resist. after 
much experimenting I exposed the board below a bug zapper for 4 min. 
with great sucsess the solvent developer yielding a clean, ready to 
etch immage. lesson learned don't expose to too much temp. I would 
coat the board  with a foam brush and leave the coated in a shoebox 
to dry horiz. over night 
dust free. I have a lot copper clad on hand mostly fr-4 various 
thicknesses thought about sell it on ebay. don't think I will return 
to writing hobby project articles anymore the magazines don't exist 
that I contracted with. So those that need some clad pieces contact 
me