Hi All,   After putting shins on my ANH-armor I used ABS-paste to fill the gap between the 2 parts. The ABS-paste was made out of the same material as my armor. After filling the gap and drying, the paste is the same color as my armor. After grinding (using wet grinding-paper 180-400-1000-1200) the filled gap changes to a darker color.   Does anyone know how this happens and how I can prevent this ?   Thanks,