What is a crucial maintenance practice for paint brushes?

A crucial maintenance practice for paint brushes is washing brushes after use. Proper cleaning ensures that paint does not dry and ruin the bristles, which can affect the brush's performance in future use. After painting, it is important to remove any paint residue by rinsing the brush in water (for water-based paints) or an appropriate solvent (for oil-based paints). This practice not only extends the life of the brush but also maintains the integrity of the bristles, allowing for smoother application in future projects.

Standing brushes on handles can lead to paint pooling and damaging the ferrule (the metal part that holds the bristles), while standing brushes on bristles can flatten and deform the bristles, compromising their shape and effectiveness. Lastly, using cold water for cleaning may not be as effective with certain paints, especially oil-based ones, which typically require warm or hot solvents for thorough cleaning.