I've just tried silverflow 55 – it's different to easyflo! It takes more heat to remelt it. If it has only just melted you get more of a fillet, but this is hrd to control.
I used it to do this little tank for the shunter (about 1 1/8" high, from 0.7mm brass. First time I've tried something like this – it left several joint lines visible as when I attached the base a the solder in the curved joints seemed to run out. A bit of hi-build primer should sort it out though.
Neil