Homebrew PCBs

Hi all,

I have a few sheets of 90 mil FR-4, (red imprint) that is double 
sided.

I need to do a lot of 1 sided boards and instead of ordering one 
sided, I think I'll just etch one side of these to use the boards.

Anyway, I mechanically etch boards so I need to remove the copper in 
wholesale fashion and have no chemicals to do so.

To make matters worse, the boards are 10 x 18.

What is the simplest, lowest cost method to remove one side of the 
copper ?

Also, I assume something like car or floor wax might make it easy to 
add to the good side as a resist, but suggestions are welcome.


Dave
(I'm in southern NJ if someone wants to trade for some SS 1/16 
material.)