Here's how I did it, it seemed to work OK:
1. Wetted out the cloth onto the hull w/ "plain" epoxy
2. Masked at the waterline w/ high grade masking tape. I levelled the hull on horses, and then used a laser pointer on a jerry rigged stand to mark out points along the hull. Then I connected the dots with the masking tape.
3. Applied the graphite/ epoxy to the bottom. I removed and reapplied the masking tape betwwen coats. Kind of tedious but I didn't want take a chance on the tape being glued to the hull.
4. Did the fill coats on the sides of the hull, also masking at the waterline, overlapping the graphited portion by a millimeter or so
As far as sanding goes, I got a very smooth finish so I didn't have to do a whole lot of smoothing out, just follow the normal procedures. Good Luck!

: I'm ready to 'glass the bottom of the hull over and I want to use the carbon
: graphite powder from the waterline down. I know not to mix it in when I
: wet out the 'glass but, should I use it for all of my fill coats after or,
: fill the weave, sand it smooth and put another coat with the graphite in
: it then?
: I think using it in the fill coats would be a good idea but, how would I get
: a nice line down the side of the boat? Should I fill the sides first with
: clear epoxy and tape off the bottom and fill it seperatly? I'm only
: planning on graphite on the bottom and about an inch above the chine (S&G
: Hard Chined.)

: Also, I've heard this stuff can be a bear to sand once it's cured but, I like
: the idea of less resistance thru the water. What's the right grit paper on
: my orbital to use?
: Thanks much for any help. My next step is to make the forms for the strip
: deck. With the hull done, I dont think I'll need a strong back and am
: planning on hot glueing the forms to the hull for support (I saw a website
: where a guy did something similar and the forms were only an inch or so
: thick (Center stuff cut out) to make strip clamping easier. Any ideas on
: how to go about this? There are no real plans to go by because I'm taking
: the Guillemot S&G and putting a strip deck on it using the Guillemot
: offsets from Nick's book (And a little doctoring of the numbers in AutoCAD
: to match the hull)