I think this peanut oil last around 1 month, give or take a week.. Its been pretty hot a few days in SoCal in the past month and no there is alteration to the effect of peanut oil to the molding, or actually I have been using canoil oil lately. Like I have said in the past, the Oil is a great fix but ofcourse only temporary. It is better to respraying them like Woody mentioned or buying new ones at that (to bloody expensive though). Nothing has happened really, oh there has been some greasy residue found but it was easily cleaned. Besides that it is a great fix and always worth the 5 minutes.