This video shows you how to build and convert Mephiston of the Blood Angels and end up with a result that has no mould lines or gaps.
The following tools were used in the video:
Tamiya Extra Thin Cement
Revell Contacta Plus Glue
Greenstuff 2 Part Yellow and Blue epoxy
Scalpel
Clippers (I used Tamiya 300074123 - Diagonal Cutter)