Sealmaster
Do your self a favor, buy a 200-300 gallon ag tank off Craigslist and keep it. Throw a cheap ball valve on it and buy in bulk it’s way cheaper. Purchase a seal broom as it get material in the the cracks better then a squeegee.
1 gallon of seal master on decent asphalt, not horribly cracked and pitted, should cover roughly 50 sqft.
I’d get double what you think you will need on that conversion so you can do 2 thick coats if it’s been a few years. Don’t cut your seal with water. Unless your dealer tells you to and they will line you out on how many gallons to add.
If you have cracks that look like an alligators back or spider webs just DM and we can talk. You should seal once a year with 1 or 2 coats. To keep up with the maintenance schedule for asphalt