Thanks for this. The paint calculator on the Micron site suggested just over a gallon per coat for Micron 99, but your usage of 5 gallons is more in line with the estimate I received.Last bottom job in 2021 used 5 gallons. I suggest you look at Seahawk Biocop TF paint. Has worked unbelievably well. First bottom job with it in 2016 lasted 5 years. When boat was hauled, bottom still looked great. Yard charged $301.00 per gallon in FL.
Five gallons for a 50' boat seems high to me, that is unless they plan on applying four to five coats. I apply ours with a one inch diameter dense foam roller.but your usage of 5 gallons is more in line with the estimate I received.