The best way to prevent a stain is to clean a spill as soon as possible avoiding the spill to dry and stain.
Once the HydroDeck has been installed, it is best to store out of the direct sunlight (full boat cover, covered slip, garage, etc. It is also important that the product is not stored near any highly reflective areas that could result in premature aging of the product. Keeping HydroDeck out of the elements will increase the life of the product. It is never recommended to keep in direct sunlight.