Vallejo Reducer. I'll never don't give up to recommend my method. Everyone who tried this, never go back to use nail polish, floor polish, etc. Pure polyurethane. Very liquid. Use a half drop, move the articulation, let it dry several hours, then use another half drop. Do it till obtain the tightness you like. Normally for me, it works with the first or second drop. No more. No peeling, no flaking. Invisible to the eye. Just perfection. In my opinion I'll never put KiKi or floor polish on a figure... Parfums, wax, cleaning chemicals mixed with water and polyurethane... I don't know how the people is capable to use this things instead pure polyurethane. Vallejo Reducer it's a commom product for reduce paints, very cheap. You won't finish the bottle in your whole life.