Hydrophobic simply means a surface repels water. Hydrophobic coatings are extensively used globally on a wide range of surfaces including glass, stainless steel and even in medical applications (to coat surgical instruments).  In simple terms when a surface has hydrophobic properties, water will tend to sheet or roll off the surface which can help take away dirt, dust and grime.  Maintenance is significantly reduced as the coating reduces the adhesion of contaminates making washing easier.  Maximum performance is achieved once the HYDRO coating is fully cured.  This depends on exposure to UV which is the catalyst for the curing process and would usually take around 3 days after application.