WD is just that, a Water Dispersant, not really a "penetrating oil"
There are other, better products.
WD will not hurt anything but the best I have found is Kroil.
We used to buy it in 5 gallon pairs and it is pricy! and stinks like a skunk,
--- ok not that bad, but has a distinct offensive odor.
But it works,--- others are nearly as good like liquid
wench 
and PB blaster to name a few.
