For the exterior logs of your log house or wooden building you will need to find an Exterior wood preservative because they are specially designed to be water and weather resistant. The best preservative is one that is made with natural oils to give you the highest quality finish. Many exterior wood preservatives will contain active ingredients which will help to protect your logs against mildew, algae and any fungal attacks but you must make sure that they are also UV resistance. There are many different colors available in the natural oil wood preservative range from a natural look to the bright and bolder colors that will really make an impression. When using a colored exterior wood preservative that will not only color your logs but also protect them you can be very creative giving the exterior of your home a unique style.