Paint will not dry
you did not state what paint, on what surface, what is temperature and humidity.
paint usually do not dry if it is two pack and you used only part a (body of the paint) and did not add any part b (hardener). hardener allow chemical reaction to occur and creates then solid, this type of paint is often used on car bodies, boats, hard wearing flooring and similar surfaces. if this is the case, you need to strip and clean whole area, prepare it again, whip off with weak solution of appropriate solvent mixed with bit of hardener (about 1hardener to 25solvent by volume should be fine) rest it for 48hrs, fine abrade with 120 or 150 paper or screen and then paint again following instructions on the label. this usually involves two parts urethane based paints.
another - it can be oil paint - oil paints,, especially good quality (artist quality), based on linseed or cannabis oil, take up to few years to dry, they drying process is affected as well by humidity and temperature, if temperature drops below 10centigrade (50f) process of drying virtually stops, it will fully stop at about 2 to 4 centigrade (35f - 40f), humidity will greatly affect this process as well, very low humidity (below 10%) and very high humidity (above 80%) will hamper drying process, low by forming impenetrable surface skin and not allowing body of the paint to dry, high by preventing vapour pressure to evaporate.
please provide bit more info and then we may find better advice...
do not hesitate to ask extra - and do not forget to vote...
on Aug 10, 2018