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.
Unfortunately, the decks/stairs had a solid stain applied 6 years ago, but I don't know if it was oil or water-based. I have applied 3 brands of strippers, which left about 80-90% of the old stain on wood. Then I sanded the upper deck with a plate sander and actually removed about 95%.