It is messy work, but will ensure the longevity of the bottom for the next 50+ years, that's the claim anyway. "Time will show.."
It took 30 tubes of 5200 to cover the bottom with a 3/16" V-trowel.
I will let the 5200 cure for a short week, put the wheels on again and take the hull outside for initial sanding. It create a lot of dust, and I rather do that out in the drive way.