Using salt and sponges to create watercolor effects can be tricky because:

• Different Results: Different sponges come in different sizes and types, which gives different textures.
• Too Much Salt: If you use too much salt, it can mess up the look you want. Not using enough salt might not do anything at all.

To make things easier:

1. Try it Out: Play around using different sponges on some extra paper.
2. Watch the Salt: Use just a small pinch of salt to see how it changes your painting.