I'm on the 3M train, too. It's just such a cost to saving ratio that for me it's a no-brainer, given how gravel/rock heavy Calgary roads are. Cars with tons of rock chips just look so beat up, and it's such an easy fix.
Also with Sliver's suggestion on the get in the habit of taking your garbage/stuff with you when you go and not treating your vehicle like a rolling garbage can/mobile storage unit.
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