Hello- We just had Gaco Western Wall spray foam installed last Wednesday. The first day it was installed it did not smell and the second day it still did not smell. Those two days the weather was cool and gray. On the 3rd day it was sunny and the house was heating up that is the day the smell started a fish odor. Our walls are not closed up yet. I have contacted the contractor he said this has never happened to him before. I also called Gaco and they said they would contact the sales rep in our area to come over to our house. The smell only happens in the midday. At night and early morning it is fine.