Is this ok for pcbs? normally i don't care about cosmetics, but if i make a board for someone else how can i clean it? ipa?

I use it for cellphone PCB soldering..I have also used it on a prototype board..it has a low melting point It gives a good finish..& cleans easily.. You can use Mg chemicals 99.9% alcohol to clean..or ABRO contact cleaner..or WD40 contact cleaner..FLUX is also easily cleaned by warming the board up a little and then use the alcohol with a brush to clean..

I see different 63/37 kester types of solder. what is diff. between rosin core (i know what this is), organic core, no-flux core?

Just so you know "Water Soluble" flux is highly corrosive... You might think it's safe as it's called organic/water soluble, but it will strip you tin within hours if you don't completely clean it. This solder is an "RMA" solder or "Rosin Mildly Activated" it is a very safe flux that doesn't require post clean, though your surface to be solder must also be very clean as it doesn't have much in the way of cleaning action.

what is the melting temperature of this solder?

* Melting Range: 361º F, 183º C

Is this solder multicore ?

Multicore Solder is a different manufacture, this is Kester Solder, all the same

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