Need pointers on using Behlen Water Based Grain Filler. The can I have is called Neutral which is kind of light cream/white colored. Should it be tinted with a tint near the same color of the wood or the stain to be used or what? Any info would be helpful. I had planned to use in on red oak but don't like any of the test I have done. I have tried putting stain on the wood first and then filler on first and still the filler is somewhat visible in the open grain of the wood.