The way I've heard it used, it is when the coating forms a film over a hole. Either because you want it to, or don't want it to.
So if it is too thin, I presume it will not form a strong enough film to bridge a hole reliably.
Steve Greenfield AE7HD
--- In Homebrew_PCBs@yahoogroups.com, "Phil@..." <yahoo@...> wrote:
>
> I guess I don't know what "tenting" means.
> --
> Phil M.
>
> ----- Original Message -----
> From: "cunningfellow" <andrewm1973@...>
> To: <Homebrew_PCBs@yahoogroups.com>
> Sent: Wednesday, May 22, 2013 8:13 PM
> Subject: [Homebrew_PCBs] Re: printer
>
>
> >> 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.
> >
> >
> >
> > ------------------------------------
> >
> > Be sure to visit the group home and check for new Links, Files, and
> > Photos:
> > http://groups.yahoo.com/group/Homebrew_PCBsYahoo! Groups Links
> >
> >
> >
>