At the nature center where I work we have a 1/3 mile long boardwalk
that winds through a forested area and a mangrove swamp. There are
sections where there are slight dips and rises. These areas are
periodically treated by spraying with an adhesive to which a light
coating of fine sand is applied. This method virtually eliminates the
possibility that someone might slip on the boardwalk when it's wet
(which is most of the time, here in south Florida).

If you'd like the name of the adhesive we're using I could find out
for you.

BTW, have you considered recycled plastic composite "lumber"? It's in
use at another park in the city where I work; it's attractive,
splinter-free and doesn't warp.

Rhea Tannenbaum
Exhibits Coordinator
Gumbo Limbo Nature Center
Boca Raton, FL
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RheaT