Homebrew PCBs

Anyway, i bought the more expensive silver paste because it must surely be  
better ;-)

BUT, it seems to reflow in the same strange manner as the leaded paste.

When you heat it until it has a dry, grayish appearance, and then wipe it  
off, it will come off as sort of dried paste/powder, BUT the board will be  
tinned in a thin, shiny layer.

When you heat it further, until it reflows, it will get a dull, rough  
appearance from where the particles melted.


I don't understand the first thing. How can it tin the board without  
melting, at all?
What happens?


ST