On Mon, Mar 25, 2013 at 10:33 AM, Hari Hendaryanto <
hari.h@...> wrote:
>
> i'm a newbie on photoresist method. i've read homebrew's archives/forum
> about how to stick dry film to pcb,
Have you tried different temperature settings and times for your iron?
For example, a lower temperature? A higher temperature but for a
shorter time? What do the instructions for the resist say?
Also, the copper of the PCB must be really really clean (this goes for
any method involving bare copper). You can clean it with a scouring
pad (not steel wool, the green 3M ones work well), then use IPA
(isopropyl alcohol) or denatured alcohol and paper to scrub the board
until you're no longer getting any crap on the paper. That will help
the resist stick to the copper.
This is probably a dumb idea, but when applying sticky films, often a
layer of water is sprayed onto the surface first. The water forms a
very thin separator between the surface and the film. Air bubbles and
the water can then be worked out with a squeegee, to the point where
there's no air and no water. You might be able to try this, followed
by something like a heating period in an oven. Experiment!
Good luck,
Mitch.