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.
Costs. A professional concrete contractor will typically charge $2-$4 per square foot for a simple stain application, including the sealer. A stain application with patterning and sawed lines will typically cost between $4 and $10 per square foot.Multiple color patterns and intricate sawcuts can run between $5 and $15 per square foot. Elaborate sandblasted stencil work and layered staining can cost between $12 and $25 per square foot.ach chemical process is unique and each slab of concrete is unique, leaving you a one-of-a-kind finish. Instead of hiring a painter to paint your concrete floor, only to have it crack, peel and fade in a few years, stain it. A stain can be applied to new or old concrete floors, revitalizing lackluster surfaces.