Sto's Stolit Lotusan 1.5 is super-hydrophobic -- it's extremely water repellent, it has a high resistance to soiling, and it now has an improved resistance to mold, mildew, and alge. A permeadable vapor allows your substrate to breathe naturally, while resisting blisters caused by trapped vapor. Sto's Stolit Lotusan 1.5 is ready out of the bucket (no additives needed) and it meets South Coast Air Quality Management District requirements.