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Hi Tim, I've used LP, Mapp and Acet and they all work well on CU. Clean the fittings with a round wire brush and the pipe with 100grit emery paper. Heat one side well then slip over to the opposite side and give alittle heat there then return to side #1 heat and add solder at the joint while moving the flame back to the center of the fitting. This sucks the solder into the joint for a 100% fill and the joint is full when solder is dripping from the bottom side, then take a damp (almost dripping water) cotton rag and wipe the joint all around. This leaves a very nice finished joint and quickly chills the solder. A lower heat is better than a higher heat flame as it makes solder control very easy. If for a domestic water supply you will want to use lead free solder (plumbing code), 95/5 about 400*. You might also need some acid, 4oz as it last along time, and a acid brush. Harris makes a good acid and solder products. Joints do not have to be pre-tined. Alot say you don't need to pre clean the pipe and fittings but I have found the solder runs alot easier if you do and have leak free joints when done with the solder flowing freely. Have fun! T_Bone
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