wanting to repel solder

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yah that's right, I want to repel solder in a part of an assembly  If course, it has to tolerate being heated so it can't then flow all over the place.I may use the plumbing silver solder or real cad free silver solder but I want that the solder should definitely NOT climb to parts of the assembly.Is there a product that does this?A method? Will rubbing high vacuum grease on the surface to be protected do the job? Will the crease spread with heated and ruin the solder joint?? I recall an old timer telling me to use  Graphite for stick welding,  He had a chunk of graphite he'd file and sprinkle the dust where he didn't want weld splatter to stickHey~!! It's a hobby. It's not supposed to make sense~!!
Reply:See post #11 here:  http://www.practicalmachinist.com/vb...inless-178702/Use Milk of Magnesia as a solder stop or mask.  You could probably use one of those ceramic MIG nozzle anti-spatter products like BorNiGuard. Even a thin wash of clay or Satanite refractory mortar would probably work - as used in making the Hamon lines on Japanese style knives and swords."USMCPOP" First-born son: KIA  Iraq 1/26/05Syncrowave 250 w/ Coolmate 3Dialarc 250, Idealarc 250SP-175 +Firepower TIG 160S (gave the TA 161 STL to the son)Lincwelder AC180C (1952)Victor & Smith O/A torchesMiller spot welder
Reply:Originally Posted by OldendumSee post #11 here:  http://www.practicalmachinist.com/vb...inless-178702/Use Milk of Magnesia as a solder stop or mask.  You could probably use one of those ceramic MIG nozzle anti-spatter products like BorNiGuard. Even a thin wash of clay or Satanite refractory mortar would probably work - as used in making the Hamon lines on Japanese style knives and swords.
Reply:Carbon black would work in lead casting - relatively low mold surface temperature and little free oxygen so it won't burn off. Milk of Magnesia is Magnesium hydroxide - Mg(OH)2. If heated over 660 F it decomposes to MgO (and releases H2O).  A refractory with a melting point over 5,000 degrees F."USMCPOP" First-born son: KIA  Iraq 1/26/05Syncrowave 250 w/ Coolmate 3Dialarc 250, Idealarc 250SP-175 +Firepower TIG 160S (gave the TA 161 STL to the son)Lincwelder AC180C (1952)Victor & Smith O/A torchesMiller spot welder
Reply:A simple repel for solder is a No. 2 lead pencil.  Simply draw out the areas you wish to protect and fill in the gaps.  Pencil lead is a clay/graphite mixture so in theory it should take about any amount of heat.RogerOld, Tired, and GRUMPYSalesman will call, Batteries not included, Assembly is required, and FREE ADVICE IS WORTH EXACTLY WHAT YOU PAY FOR IT!Dial Arc 250HFThunderbolt 225 AC/DCAssorted A/O torches
Reply:I could just send you the flux I picked up for a soldering job. Seems to repel flux in most instances, I can't get it to solder once I put it on anyway.
Reply:IN jewelry they use ochre, paints on and driesAlso try that white liquid paper stuff.testing before your finished piece.
Reply:Originally Posted by 12345678910IN jewelry they use ochre, paints on and dries.
Reply:The electronics industry uses Kapton polyimide tape to keep solder from sticking where they don't want it during immersion soldering.Last edited by 76GMC1500; 12-08-2015 at 10:12 PM.
Reply:Originally Posted by 12345678910IN jewelry they use ochre, paints on and driesAlso try that white liquid paper stuff.testing before your finished piece.