I use boards from M.G. Chemicals (www.mgchemicals.com).  They have a white
peel-off layer over the resist.  I actually thought all pre-sensitized boards
had this, otherwise I would never have said to cut resist side down.

As for how the resist gets damaged, it's hard to tell, but I think it must be
the "snap" when it's cut.  Narrow cutoffs have more damage that wide ones,
absolutely, not relatively.  Or at least that's what I think today.

Colin




On Thu, 2 May 2002, Rick C. wrote:

>I have cut sensitized boards a narrow as 3/4 inch wide with my paper cutter
with
>absolutely no damage to the resist, even double sided. I don't know how the
resist
>can be damaged. If the cutting wheel works, that's fine.
>Rick.

The resist is easily scratched. Put adhesive paper strips on the cutting
table around the wheel and keep it clean all the time to avoid this.
Resist scratches cause cut tracks in narrow tracks (20mil and under). Some
resist is more prone to scratches than others. The least prone is the kind
that comes with peel-off black paper shields. It's also the most expensive
...

Peter

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