Homebrew PCBs

"P" <apache2000_nl@...> writes:
> For backingmaterial I use an old piece of PCB or, and that's what PCB 
> manufacturers use, a piece of MDF with a sort of hard coating

Since my drill press is wooden, I just fill the hole with wood filler
when I'm done.  The next time I use it, it's hard and I just sand it
smooth.