By the early 1990s, Rwanda, a small country with an overwhelmingly agricultural economy, had one of the highest population densities in Africa. About 85 percent of its population is Hutu; the rest is Tutsi, along with a small number of Twa, a Pygmy group who were the original inhabitants of Rwanda.
1 Power sanding, stain and seal â This is a very aggressive procedure normally used on decks that have not been well kept or are changing color. The average cost is $2 to $4 per square foot.  Light sanding, stain and seal â This is a general annual treatment for a deck.
Some homeowners also pour cement slabs to create a patio that is connected to the home itself. In fact, as you can see on our cement patio cost guide, you can stain your cement patio as well. Depending on the color or design, staining can add an extra $4/sf to $10/sf. Finally, cement is a very popular choice for pool decks.