Homebrew PCBs

You are right, you need an exposure setup. For developement washing soda 
is sufficient, and that's really nothing dangerous.

I bought a roll of 25 meters from Bungard. As such it was more expensive 
than the dry film laminate, but I also use a lot less stopmask than dry 
film lamnate. Here too, one person could order one and cut it in smaller 
pieces. If the need arises, I could do that. I don't currently know 
another source but I figure this one or a similar product from one of 
those manufactures which make these kind of photosentivie foils must be 
available at other places.

Apart from this you really only need to:
- produce a film (for the expouser, I use an Epson Stylus C62 and print 
on avery over head foils)
- laminate the material onto the PCB (I use a cheap office laminator for 
all my lamination needs)
- expose
- develop
- harden the result by yet again expose it, this time just longer, or 
bake it in an oven

I realize that a big (meanwhile looked at the poll) part of the list 
users use the TT method and as such may don't have an UV exposer unit. 
They then would have to use a different method, or get one. However, if 
I look at the mess involved with "spraying the conformal coating" 
compared to just laminate a foil, me thinks that getting or building an 
UV exposer seems to be the smaller of the two problems.

Just my 2\ufffd of course

Markus

iluvpcbs schrieb:
>
> Hi Markus,
>
> --- In Homebrew_PCBs@yahoogroups.com 
> <mailto:Homebrew_PCBs%40yahoogroups.com>, Markus Zingg <homebrew-pcb@...>
> wrote:
> >
> > Hi,
> >
> > Why not simply use solder stop laminate?
> >
> > Laminate, expose, develop, done - > I can't imagine something faster
> and
> > simpler than that...
> >
> > Markus
>
> I've avoided these for two reasons:
>
> 1. I don't have a UV exposure system setup
> 2. It seems like the developer needed for the soldermask laminate
> requires some caustic solutions.
>
> Can you describe the materials you use? Can you obtain small pieces
> of the dry laminate material cheaply?
>
> Thanks!
>
>