Homebrew PCBs

You can mask with a positive image on negative resist if you're plating with 
tin or tin/lead. The tin plating will then be the resist for etching. For 
through holes, you'll plate with copper before plating with tin. Masking 
before plating copper reduces the anode material used, and also doesn't 
waste the etchant required to remove it.

This is theory only, since I haven't tried plating yet.

----- Original Message ----- 
From: "Stefan Trethan" <stefan_trethan@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Wednesday, January 11, 2006 2:57 PM
Subject: Re: [Homebrew_PCBs] Re: Copper plating material(s) for a neophyte - 
tinning brush


> On Wed, 11 Jan 2006 21:38:38 +0100, Mike Phillips <mikep_95133@...>
> wrote:
>
>> Is it possible to plate thru holes on a pcb? How would you mask off
>>
>> what you don't want plated?
>>
>>
>> Mike
>
>
> you don't. You plate everything and etch afterwards.
>
> ST
>
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