I’m having a heck of a time with the resist supplied with the Rio
Grande Etch Press System (a fancy name for a Print Gocco B6 Hi Mesh
kit with an added can of asphaltum varnish and a plastic squeegee.)
The issue is that the varnish they supplied is so runny that I get a
ton of bleed out around the open areas of the master (screen).
I tried evaporating some of the solvent (paint thinner?) out of the
varnish to thicken it up. That helped a little, but it was so thick
that the screen really stuck to the metal. I plan to try again with
even thicker varnish, but I was wondering if anyone else had already
solved this problem. Alternate resist suggestions anyone? I’m printing
on copper and will etch with ferric chloride.
Note that this is not a problem limited to the Gocco. I am having the
same problem with a PhotoEZ HiRes stencil as well. Maybe I just got a
bum can of resist?