Not a concern at all, as the boot covers a bump stop, which is about 4" long. If any urethane gets on the shock rod, it is covered by the bump stop, and the shock body will reach the bump stop before reaching any of the previously exposed shock rod which may have had a thin coat. The tolerance between the top of the hat, and the shock rod (where the urethane would smear) is only a thou or two... it's small enough that the friction is not holding it up, and allowing it to slide down. So a layer so "wafer thin" on the rod is not going to have much resistance.
As well, while urethane is as sticky as anything, it doesn't like to adhere to smooth surfaces and stays soft and gummy-like. Should in the off-chance any should come into contact with the seal, the seal would simply clean it off, to absolutely no detriment.
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