http://www.carbon-core.com/carbonbond-transom.htm
There is a volume calculator here and there is a Product data sheet pdf.
My V20 25" transom took three buckets $185 per 5gal bucket
When I tried to buy Arjay, I could not find anyone selling it. A chain of emails lead me to Carbon-Core
CarbonBond Transom compound. It is the same thing as Arjay & the old 3M NidaBond pourable.
You need to try and find a local seller because shipping will kill you. Use the Contact Us and ask them for info