In order to leave no or only a small amount of residual paint, calculate the amount before starting to paint. How much paint is required depends on the surface to be treated. Measure the area that needs to be painted and see the hiding power of the product on the package. Use the following formula to calculate paint requirements: total painted area m2 / paint coverage m2 / l = required paint volume l.
Sometimes, even after calculating the amount of paint you need, you end up with paint left over. So, when starting a new project, when buying paint, think ahead to what you're going to do with the leftover paint. Maybe you can use the leftover paint in another home project or give it to a friend or family member?

Wondering what to do with paint? You should follow these guidelines:
Liquid paints, varnishes, fillers and thinners, and wash water for paint tools are considered hazardous waste. Please take these materials to a regional collection point for disposal as chemical waste or transfer for recycling.It's important to note that liquid paint, brushes or rollers cannot drain down gutters, in the natural environment or in the trash.
If the can is completely dry or has no paint left, it can be thrown in the household trash. Be sure to check the instructions on the can body for what to do with the paint can. Metal cans are considered scrap metal and plastic cans are usually disposed of as household or mixed waste.
Completely dry paint tools, such as paint brushes, rollers or paint trays, can be disposed of in mixed/household waste. If these are still wet, they should be disposed of as chemical waste/hazardous waste, centralized in the area. It can also be placed still and wait for it to dry naturally.
No need. If you continue on the next day, it is recommended not to wash the paint tool. Store brushes or rollers in an airtight plastic bag. This avoids spills of paint and cleaning water.
After painting, it is recommended to remove as much residual paint as possible from the brush and roller before cleaning. If you store your tools in a plastic bag, make sure the bag is dry before discarding. It is a good idea to clean the paint tool immediately after painting to prevent the paint from drying out. If you still need tools the next day, place the brush or roller in an airtight plastic bag overnight.
Water-based paint: Do not wash tools such as brushes under running water, where harmful substances may enter the environment through the drain.
Solvent-Based Coatings: After painting with solvent-based paints, the rollers and brushes can be cleaned with the thinner indicated on the product. Please take clean water to a hazardous/chemical waste collection point for disposal.