: Hello sir,

: I have used graphite in epoxy as a bottom coat, but never tried to
: glass over it. However, you can get black lines by simply mixing
: printer toner like what comes out of a laser printer or copier.
: ONLY A SMALL AMMOUNT. It doesn't take much, and too much weakens
: the bond.

: I have also used paint pigments as well as epoxy-specific pigments.
: Again only a tiny bit. I literally dip a toothpick in the
: pigment, then dip in the epoxy and mix it (with microballoons
: for the filler as normal) and then if I need it darker dip it
: again. It takes very little.

: I have started saving my old printer toner cartridges. I have some
: magenta, cyan, and yellow from a color printer that I am going
: to one day use as pigments in the glass on a surfboard or kayak
: and get a tye dye effect... or maybe an ugly mess... who knows?
: :)

: Since you appear to be going black with this kayak, I suggest doing
: a bottom coat with graphite mixed in the epoxy. They sell it
: usually in boating stores in the epoxy section. It makes it much
: more abrasion resistant.

: ... and post pics when done!

: -Malcolm

You can also get graphite in art stores. Might be cheaper there than at a boat store.