Home-made flour based paint that will last 5+ years outside. Nontoxic and cheap.  Heat an old pot, pour in 300g flour and 300ml water when begins to heat, pour in 3 liters of water and stir (like a white sauce), and boil for 10 minutes then add 600g of pigment and linseed oil 300ml, bring to a boil for 30 minutes.  Let cool down, it&#x27;s ready, we made 3 liters of paint.