I wouldn't bother as long as the garage is heated. Mine is garaged when not driving with no issues whatsoever. The paint always looks perfect on all my cars. The dealer is always stunned by the low mileage and paint quality when I trade my cars in.
"what I'm driving here...is an ending." Jeremy Clarkson
2011 Alpine White BMW M3 6mt ZCP Coupe
2008 Alpine White BMW 328i 6mt Coupe (retired 06/21/11)