OK, the madness has gone on long enough! I will 
risk sounding like a n00b and post my question 
here. Hopefully one of you will have experienced 
this before. Let me give you some history on my 
problem:

I started painting fan cels about two years ago. 
At first I experimented with a number of 
different pens to see which would give the 
desired effect. Some would smear, but several of 
them held well to the cel. But then another 
problem arose: after applying paint over the 
lines they would 'lift,' or become very faded in 
appearance. Finally, after wasting way too much 
money on pens, I decided to simply draw my image 
on top of the acetate.

About a week ago, I visited Requiem's site and 
saw that she had a cel painting tutorial. I 
thought it would be interesting to see how our 
processes would match up, and I saw that she even 
listed the supplies she used. Thrilled, I ran out 
to the art store yesterday and got the pen. I 
even spent a couple of hours today inking and 
applying some of the hair/skin highlights. But 
then when I turned the cel over, NOOOOO! The 
lines were fading away again! How can this be?

I have racked my brain over this and can only 
come up with one solution: my paint. It must be 
my paint! I've been using the exact same brand 
that I was using two years ago, Golden acrylics. 
They are excellent in fluidity and won't chip or 
crack, so I've enjoyed using them. But has anyone 
else noticed this particular problem with them 
before? It's driving me crazy! And now I have to 
start my cel all over again! $&&Q#@&Q%
#Q^$#EV#^$#@^%@!#!!!!

Help would be wonderful. Please stop me from 
going INSANE! AHHH!