Step 3: Prepare the surface

Picture of Prepare the surface
Collate all of the tools and materials in the same place, like a surgeon.
The epoxy will set quickly when activated, so you will not get a lot of time to drive to the shop if you have forgotten something.  Planning is the key.  You can even practice without the epoxy to start, eg. use a piece of cloth or newspaper.
This may save you money as well.

Clean the surface of the boat with methylated sprits, or detergent and water.  Wait for it to dry and ensure any sea water, grime, dust, oil, detergent etc. etc. have been removed.  Otherwise the tape will stick to the dust and fall off, not the boat. Simple as that.

Mask off the section with blue painter's tape. this is so that you can remove the tape when the epoxy is 'tack dry' and thus remove any spills.

Lightly sand the affected area with 200 grit sandpaper.  This is to prep the surface so that the epoxy / carbon will take to the surface.

For cracks, it is important to prevent the cracks from further propagating.  Drill the end of the cracks out! Sounds counter-intuitive, right? http://en.wikipedia.org/wiki/Stress_concentration

You can see in the photo the prepared surface with a crack and prevention holes is ready for the carbon. 

Cut the carbon fiber to measure and be careful to prevent the ends from fraying.