I have a thought, used Snap-on screwdrivers for 15-20 years daily in the shop. Never had that white stuff occur. Took one home, within 6 months, sitting in my home box turned real milky, then the handle split. My thought is the daily coating of oil, grease, and body oil from my hands keeps handles treated. Like an old car,, they have to be used. My ACE and Proto screwdrivers from the 50s-60s show no change from year to year. Now some older Craftsman are getting the white stuff.