If there are several layers of paint it may take two applications.
One important point is to maintain the area in a wet condition. Nitromors is basically Methylene Dichloride in a gel base to try to stop it evaporating too quickly and to make it easier to apply. The solvent does evaporate, so the makers recommend applying more gel. Another arrangement which works well is to cover the area with clingfilm.
I always wear eye protection when using this stuff because it can cause blindness if it gets in the eyes. It will also burn skin. I always keep a large bucket of clean cold water close by as an additional precaution.
A good alternative is Peel Away 1.
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've used this with good results. There is a second version (7) for use on certain surfaces.
This stuff doesn't contain Methylene Chloride but does contain Calcium Hydroxide, Magnesium Hydroxide and Sodium Hydroxide so again won't do eyes and skin any good.
I don't know, but this looks to be an alkali based product so has the same handling issues.
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