You can't go wrong with the West System epoxy if you follow the directions pretty closely. They have small kits (which are pricey) and/or cans of the hardener and resin that come with pumps that measure out exactly the amount you need. If you don't to add much material to your C/B you may not need the can (1 pt. resin + smaller can for hardener).
I've used West System and it is a good epoxy.
I've used Raka and it is also a good epoxy. Here's the comparison:
West Marine - West System
1 quart 105 epoxy resin: $40
0.44 pint 206 slow hardener: $20
1 set 300 series mini-pumps: $15
$75 for 1.22 quarts, West System
Raka Inc - Raka epoxy
1 1/2 quart kit - $40
1 quart 127 resin
1/2 quart 606 slow hardener
1 set of pumps: $12
$52 for 1.5 quarts, Raka
I suppose you could get a smaller kit. For example, a 1 1/2 pint kit from Raka is $24. However, that is 24 ounces. I typically mix up 3 ounces at a time so that would be only 8 batches. Two tablespoons are an ounce so that would be about six tablespoons to give you idea. This is also less attractive because the pumps still cost $12 so a kit half the size is $36.