The Geocel 2320 is used to seal gutters made of aluminum which avoids the passage of air and moisture through small gaps by the seams of the gutter. This sealer helps give the gutter an added strength when sealing off gutter corners. Muggy, and rainy conditions do not stop you from applying this sealer, as they will not affect the durability of the sealer. Do not worry that this will ruin the elegance of your gutter as you can paint this sealer and camouflage it in with your gutter style.