Homebrew PCBs

It is awfully sticky at first, but overnight it hardens to a really hard  
layer.
If you look at colophony chunks they are similar to colored glass, and  
break in a similar way.

Some solvents might leave it sticky, as far as i know colophony is  
produced by distilling the turpentine out of tree resin.
But ethanol definitely works.


ST


On Tue, 10 Jan 2006 17:45:59 +0100, dyadic_cyclone  
<dyadic_cyclone@...> wrote:

> Does colophony really create a hard coating similar to laquer? I know
>
> flux removers are commonly available, and I have used them after using
>
>  "rosin core" solder on small boards, because, if I don't clean off
>
> the flux residue, the board will be sticky and collect dust, as I
>
> learned with a small SMT pcb I made not long ago.
>
>
> Is colophony different from common "rosin"?   Or is there something
>
> about adding a solvent that leaves the flux harder after the solvent
>
> outgasses than when it is when the flux it is in the core of flexible
>
> solder?
>
>
> Thanks,
>
> Paul