Dj1 is right, is it inside or outside? Are you trying to get a mirror like finish? Is there lead paint involved, (Europe has differant standards for when it was last applied and how to remove it)? Is it a flat surface, or one that has detail to it? How large of an area is invloved? This is not just aimed at you, I wish people would give as much detail as possible when asking for help when we can not seen the problem.