Yes used direct heat with high output solder gun, more controlled than propane torch, strap wrench did not melt. I then applied Barricade ( used for years on my firearms) or Blue Creeper afterwards. Try to avoid wd40, mostly kerosene, made for water displacement (WD) not best lubricant. A soft graphite pencil run across the threads (I use a #2 pencil) works great also and is dry direct application .