Glue the Seams
Tape over seam with blue masking tape.
Next, to fill in the seams you'll start with a dollop of polyester-based resin and add a small amount of color, trying to match the color of the granite.
Mix with a putty knife.
Keep checking color against the stone.
Create a few different colors to blend into the seam.
Add the hardener (3 percent hardener to 97 percent resin), and mix only a workable amount as you only have about five minutes to apply.
Apply a base-coat of neutral color mix into seam.
Dab in and smooth as you go.
Apply a little lighter color here and there.
Apply the darkest color last.
As soon as you're done, pull off the masking tape so it doesn't dry on the tape.
After it's dried, about 30 minutes, smooth it out with a seam stone.
Use slow speed, and firm pressure.
Keep the stone moving in small circles, you'll feel when it's smooth.