Deck flashing/sealant

Darren Wright

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Springfield, Missouri
Given that I've only worked on a hand full of decks in my life and I'm getting ready to re-deck my deck, I thought I might do some research. One of the things I plan to do is use composite for the decking, but got me to wondering about making the joists last as long as the decking.

One of the things I found was deck flashing material, much like the sticky sealer you'd use on a roof edge/valley.

https://www.homedepot.com/p/Grace-Vycor-4-in-Deck-Protector-5003029/302451944

Is this the proper stuff to use to seal the tops of the joists?
 
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