I just received my order of detail parts from Scale Structures. These items are all made from metal castings. So far they look great. There is almost no flash on them unlike the last set of metal detail parts I got from Woodland Scenics. Several of the items require assembly. In looking them over I realized that I have never assembled metal casting pieces before. This then leads me to my question. What kind of glue do I use to assemble the metal castings.