Alessio,
I suspect the best answer is something like the TINNIT approach, but ... I have gotten reasonable results using a hot plate rather than just a soldering iron. I brush flux on the entire surface, heat up on the hot plate, melt on some solder, and then use the brush (with flux still in it) to brush it out. The final result is not nearly as smooth as would be ideal, but it is a lot better than the results I got with a soldering iron and solder wick.
--- In Homebrew_PCBs@yahoogroups.com, Alessio Sangalli <alesan@...> wrote:
>
> On 07/20/2010 10:30 PM, David Griffith wrote:
>
> > Have you tried a cold tinplate solution like Tinnit?
>
> No; have you? Is it good? From the web I read once you open it it lasts
> 2-6 months. Do you know if it's possible to use "less" and prepare a
> very small quantity for smaller boards or so?
>
> bye
> as
>