Mr Dissolved Putty is a tick liquid putty much thicker than Mr surfacer 500. Making it ideally suited to filling larger gaps, joins and seems on your models. Once fully cured it can be sanded or wiped away with Mr Colour thinner or Mr Tool cleaner R, you can also use these for brush and tool clean up. A thick liquid wipe off with alcohol. Use Mr Surfacer 500 for surface work and the liquid putty to even up rough sections