I have a five gallon bucket of paint that I mixed and used last fall when the weather was still nice. It has been stored in my basement throughout the winter. Upon opening it I find a thick layer of white mold on the surface and mold growing on the lid. Can any of this paint be used if I take the mold off the top? Do you have any advice for me, other than adding some mold retardant into the paint next time? Thanks in advance.