Will the surface of aluminum contact water if the aluminum coil falls into water?You mean whether water will penetrate into the gap? If you get it out quickly, basically it will be ok. If there is something wrong, you can put it under the sun to see whether there is water oozing from the gap.That depends on how tight the aluminum coil is. If it is very tight, aluminum will stick together, thus no water can get in.Yes.Other related question