I recently purchased some Behlen Pore o Pact Oil Based Grain Filler. I opened it up and there was about 1/4 inch of oil on top and the rest of the product was almost set up solid. I stirred the product for about 30 minutes. I was making a mess and almost tipped my can over several times. I finally got irritated and used it. I don't know how it has turned out as it is drying now. I am going to guess I got about 40% of the product in suspension while stirring it. Is this normal? This is my first time trying this product.