For larter quantities of water-based paint, half inch layers of paint can be poured into a card board box lined with plastic. Allow each successive layer to dry before adding the next. Interior and exterior latex and oil-based house paints. Latex or oil-based trim, deck, and floor paints. Paint is not only expensive to buy, it is expensive to dispose of properly.
Paint is the largest component of the household hazardous waste stream.
For most jobs around the home, latex based paints are the least toxic, easiest to use, low odor, quickest drying, and durable. They are also easy to apply and clean up. Buy the right type of paint for the job. Deeply pigmented paints can separate during application if painted in direct sunlight. Research paint quality.