40ml bottle of Gunze Sangyo (Mr Hobby) Mr Surfacer 1200.

Mr Surfacer is a liquid filler/primer which is available in three grades - 500, 1000 and 1200, the higher the number the finer the filler. It can be applied by brush or it can be airbrushed and, depending on the grade, it can be used for filling anything from minor surface imperfections to small gaps. An essential addition to any modeller's tool box.