Hi,
Pro-seal34 is a good waterproof sealant that will work on a lot of surface.However as said above it will be inefficient over time on very small cracks.
Hope it helps and let us know if you found a better solution.
good luck.
Jason
I have to confess that I always wanted some of those.
Here is a site where you can get customized ones:
Google "saloondoorsemporium.com"
It may seem a little expensive but how can you regret getting some.
Good luck
