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Subject: How to mask bottom layer from etching?

From: "lnphoenix" <Lnphoenix@...>
Date: 2008-06-11

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?

TIA
Lanny