Originally Posted by Dadic 78
Do yourself a favour, and purchase some LIQUID FLUX. Flux allows the solder to better adhere to the metal you're soldering. Liquid flux is awesome, because it get's "into" all the wires we use in R/C.
It will make you much better at soldering than if you didn't use it. You can get it at Home Depot in the plumbing section. Apply it with a Q-tip.
Just make sure it's not acid based flux, which will cause you all sorts of grief long term.
Overall, the rosin core solder and 45 watt iron from Radio Shack are a great set up which will do everything you'll ever need to do in RC for years.