Ramon,

Check with a company called Caplugs, I use them for supplying me masking
boots prior to conformal coating. They have static dissipative material that
they can make them out of. Go to:

http://www.caplugs.com/

What I do is send them a board that I have masked with tape to show them what
I'm trying to mask, then they send me some samples of the boots they've
selected to be sure that they will work, then I'll order them. Most of them
that I have used are stock items. Their standard turn is two weeks...

-Steve Gregory-