Contrary to appearances, to be able to enjoy an aesthetically pleasing and well-cared-for window sill for many years, it is not enough to spend a substantial sum of money for this purpose. This applies in particular to window sills made of steel or aluminum sheet and mounted on the outside of buildings. It should be borne in mind that even materials with a very high resistance to adverse weather conditions, including the most damaging effects of water, after a prolonged time of exposure, gradually lose their resistance and begin to corrode at the edges. Unfortunately, from that moment there is just one small step to complete disintegration of your window sill after which it will have to be replaced. Therefore, it is so important to remember that the window sill end caps are also necessary to effectively protect the edges of the elements against rust. They are available in many colors, so that they can be easily matched to any window sill. The investment is really small and its effects far outweigh its cost.