Homebrew PCBs

On Sat, 03 Feb 2007 20:57:46 +0100, Mark Merclean <mamhouse@...>  
wrote:

>
> 1) I get a bunch of nice spherical silver solder balls sitting in a
> field of dried out grey mud (ie, the solder paste without the solder
> balls, dried out and coating the pcb)


If you wipe off the grey paste, is the underlying surface tinned?
I noticed i do not need to reflow the paste fully to tin the surface.
No idea why or how that works.

ST