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.
Cost of Staining a Deck. 1  Applying a semi-transparanent or solid color stain to the deck can add consistency of appearance while protecting the wood from the sun's UV rays. Normal procedure is that the deck surface first be cleaned (either by pressure washer or by hand) and then, after let to dry, stain is applied.