Building up Aluminum with Spool gun

[Doublewide6]

Hi, I recently repaired a broken bolt hole that the aluminum casting was broken right through the bolt hole. I put a steel bolt in the hole and built up the Aluminum around the bolt to repair the casting. It worked but the hole needed to be retapped. I was wondering is there any product (oil or anti seize?) that I could put on the steel fastener to keep the aluminum from sticking to it at all so that when I unthread the bolt the hole doesn't need to be retapped? Thanks

 

[Doublewide6]

ok thanks, I am aware of that, but I do not always have the right size stainless steel fastener sitting around.

 

[Munkul]

Do not put oil or antiseize on said bolt, it will contaminate the weld and make it porous and horrible