Homebrew PCBs

Dave,

If you go through the trouble of chemical etching just one side then 
you should do the whole job that way. It wouldn't take much more 
effort to etch the desired image.

If you need dry film photoresist applied to your boards I can do that 
for you. I use a DuPont laminator to apply 1.5 mil photoresist to 
copper clad panels for etching. 

If you coated one side of your two sided material the unwanted side 
will etch clean and the coated side will have the image you want.
This is how we made single sided boards when I owned a commercial 
plant. We always used double sided laminate since it was actually 
cheaper than buying single sided material. One side was imaged and 
then etched to leave them desired image and to remove the unwanted 
side.

If anyone need dry film coated FR-4 or CEM-1 laminate contact me 
direct for more information. This is the same type of photoresist 
that Kepro used to supply.

Tom

--- In Homebrew_PCBs@yahoogroups.com, "Dave Mucha" <dave_mucha@y...> 
wrote:
> 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.)