Amazing stuff. When we finished our deck, which is made of IPE it was smack in the middle of the rainy season so we never got it oiled. Then, the time to do it just never seemed to come up. I finally got out the pressure washer and got it and the house cleaned. This is what happens in the Pacific Northwest.
You really have to keep up on the moss growth. In the winter the deck gets too slippery to use. The pressure washer works great but it really hard on the wood. I had to do some sanding before I oiled it. You can really see the contrast here where the decking had already turned gray the oil brought back all the beautiful colors. IPE is basically red but has greens and purples and even some yellow in it. It is very hard wood.
Now the wood looks like it did when it was new and with the slippery moss cleaned up the deck is way more usable.
I used one gallon and got the floor and some of the railing done. I need one more gallon to finish the steps. It really was not all that tough to do and took about an hour to put down once the cleaning was done.