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m Ransley
 
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Default Durham's Rock Hard Water Putty

Your stairs hold water probably because you instaled the wood with crown
grain up. It cups up with a low center. Wood putty will fail on a
horizontal flexed piece of wood like stairs. You should have hand picked
prime pieces. Wood base putty is basicly crap, a temporary solution.
Flexing stairs will crack anything but a good caulk . Turn over the
cupped wood if grain doesnt crown down.