If your paint looks clumpy, it's likely because the paint has become too thick. This can happen for a number of reasons:
- The paint was stored in a cool place and the temperature caused it to thicken
- The paint was left opened for too long and the evaporation caused it to thicken
- The paint was mixed with another type of paint or substance that made it thicker
To fix this problem, you'll need to thin out the paint. This can be done by adding a thinner, such as water for latex paints or mineral spirits for oil-based paints. Start with a small amount and mix it in well before adding more until the desired consistency is reached.