Bear,
First look at this site for extensive information on Top Hats.
www.tophatyachts.comFor your anti-fouling you have to apply three coats [with a roller] to meet the manufactures specification.
That means about 6 litres of anti-foul.
Now the tins come in 4 litre amounts and if you put on only one tin [2 coats] you will be back to do it all again in 12 months.
But if you put two tins on for 4 coats it will last just over three years and you will save the cost of two slippings and one tin of paint!
I have always used Altex No5 on my Top Hat Seaka.
That's a neat Top Hat, if you feel happy in her BUY IT!