try apoxy resin , i have used it to create a seal in a salt water tank madoe out of cinder blocks (2ft H X 3 Ft L X3Ft D) and inside coated with an apoxy resin and it stood the test of time 8 yrs in salt water 24/7 algea and all that good stuff before i had to take the tiny exhibit down and it never harmed teh fish ... so i imagine this could work for your decking as well , it dries smoothe and is resitable to anything except fire .... the best place to get this kinda stuff is at a marine shop where they sell repair apoxy and paint ... they should have it but it runs fairly expensive ....

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