Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

> Phil wrote:
>
> I haven't measured the film, but I'd guess
> about 1 or 2 mils thick.

33um (1.3 mil inch) is the thickness of stuff
that the manufacturer of the stuff I use says
is unsuitable for "tenting"

50um (2 mil inch) is listed as good for tent

So 1..2 mil could make a difference.

I nice high contrast phototool makes a diff
too. Getting the tent all UV'd up before the
develop step.