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Joe -

Just use Boat Life's Life Caulk.

For prop selection, you will want either 3" or 4" less pitch for 5500 feet of elevation.

Are you planning on running at sea level as well?

I would take advantage of Ken Reeves return policy at PropGods, get his advice and buy it from him.

If its not right you can go with another for a restock fee.

www.propgods.com