I recently sanded down all the old flaking varnish on my deck rails on the Hunter 27. Ive used Cetol before, but was surprised that after they were well sanded to bare wood, there appears to be a fair amount of dark lines, after the 1st coat of Cetol Natural Teak. Is this common with Cetol, meaning the look, bringing out a dark grain? Ive used this product on Oak companion-way boards and it was not this dark.