I've just finished laying cherry hardwood floors (3 bedrooms), but the filler doesn't match everywhere. Does the filler darken overtime, and I shouldn't worry about it so much? I've also used indoor/outdoor spar urethane (semi gloss). Was this the right thing to do? If not, what is the best product for long wearing floors. However, the floors do look beautiful. I have living room and dining rooms to do, and would appreciate advice from experts. thanks.