Homebrew PCBs

----- Original Message ----- 
From: "lnphoenix" <Lnphoenix@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Wednesday, June 11, 2008 6:51 AM
Subject: [Homebrew_PCBs] How to mask bottom layer from etching?


> I'm about to make a microwave test PCB for the first time, using tone
> transfer. The PCB size is about 4"x4" with the bottom layer is served
> as a ground plane. How do I mask the bottom layer so the copper
> remained intact during contact with ferric chloride? Vaseline? Masking
> tape? Huge tip marking pen? Some kind of chemical etching resist?

Parcel tape works quite well.

Leon