Sunlight helps,but not absolutly neccasary. Never had sunlight in my re-finishing shop Heat from rubbing should be suficient. youay want to use a hair dryer for a bit,and if oil "bubbles up",wipe it down,let it set a day or two,hit her with the hair dryer again,and if no oil comes out,rub with a cloth rather vigorously,let it set again,and if ya think it need's more, VERY SPARIGLY add more oil with your finger tip,making sure you rub her good and wipe her down after,check the next day,and if good,wax her up and enjoy!