Merlin's advice above is excellent. I went with EternaBond Tape to hopefully be once and done. You will still need to thoroughly clean before applying and a weighted roller to apply it. Wow, is it sticky, so be careful! It is suppose to last 18-35 years exposed to the elements. I put mine on the perimeter, around AC, vents, etc 3 years ago and still looks new. If I remember correctly, it was considerably more pricey than Dicor.