Electronic Soldering Flux:
Alternatively, you can melt the rosin directly with a soldering iron to liquify and then dip in the solder, a lead, or wire.
You can soften the rosin by adding something like vaseline / petroleum jelly to it when molten for rub-on application.
Lastly, you can take an alcohol based mixture of rosin, add water, and evaporate at room temperature to make a water-based emulsion.
Athletes (baseball, gymnastics) use rosin in the form of 'rosin bags' to enhance grip on sports equipment. If available, rosin bags provide the no-fuss source for raw rosin.