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Hey all, I finally started construction this past weekend and soldered my first rail. Was using a 100-watt gun also, but instead of flux-cored solder, i used flux paste and a very thin solid solder. It worked very well. I've done lots of wiring in the past and my problem with flux-cored wire is that the flux tends to boil out of the solder before the sodler itself melts. All I did was dip the ends of the rail or the joiner in the paste, put the joint together and start heating it. As soon as the flux begins to melt, I touch the solder wire to the tip of the gun and let it melt, and VOILA! It flows right into the joint like water. Just thought I'd throw in my two cents' worth.
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