Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "Nick de Smith" <nick@...> 
wrote:
>
> Hi,
> 
> I'm using an HP LaserJet 1300 set to "Dark" on 600dpi to print 
simple 
> PCBs (10mil or greater widths).
> 
> When I look at the masked areas under a microscope after etching 
with 
> sodium persulphate, I see a lot of porosity, i.e. little holes 
etched 
> in the black areas. I'm ironing quite heavily and the boards look 
very 
> solid when inspected under the uscope after the backing paper has 
been 
> soaked off so I don't think that this is an adhesion issue....
> 
> Is there anything that can be done to make the ink less porous? I 
note 
> that http://www.pulsarprofx.com/ have what they call a green "TRF" 
that 
> is supposed to do this - anyone know what it really is?
> 
> Cheers
> 
> Nick
>


Re-heat the PCB AFTER transfer to "re-flow" the toner and fill in the 
pinholes.

--
James.