How long till rubber cement sets?
Rubber cement is actually rubber in a solvent. As the solvent evaporates out, the rubber thickens more and more until it is hard. So, it varies, according to how much of the rubber cement is exposed to air so the solvent can evaporate. It works so well on paper and other things like paper because paper is porous. The paper is like nothing is there to prevent the solvent from evaporating. It will take forever to cement hard plastic since plastic is not porous and the solvent can only get out at the small edges that are uncovered. Nail polish is the same kind of dissolved solid, that hardens as the solvent evaporates out. In nail polish, the solvent is acetone, which is what is mainly in nail polish remover. Rubber cement also has a thinner available for when your can of rubber cement gets too thick.
