The number of minimum size paint bucket? How much house can brush? What brand is better?

Minimum of 1 liter size usually around 10 square meters brush brushing 2 times a light color is 5 meters in depth of color depends on what brand you buy the brush usually 3-6 times the brand is 2-3 meters and a large specifications and the most common is 5L 15L 18L smaller package worth more to buy a small package that you do not lose , like painting , but a waste of money to sell 50 1L 15L 5L 220 and sold and sold in 580 do not understand? Want to try a grade point Xuan Wei Wei Lu, etc ( a full band Ganqiao Wei word ) to use the general idea of ​​the teacher to try and Dulux are aromatic, and very personal feeling does not mean the public! ! ! ! !