It is not good practice to deprive stainless steel of oxygen because it needs oxygen to achieve passivation - the chemistry for its corrosion resistance. It is especially bad practice to do so with stresses present (as in tensioned shrouds) and in a chloride-rich environment (sea water). And while a passive layer is formed early, it is a continuing process. Parceling, where applied, would keep oxygen from reaching the stainless steel.
One of the benefits of stainless steel shrouds, IMO, is the fact that they do not need to be parceled. For if one is prudent about inspecting one's rigging, parceling must be removed and re-applied.
If your desire is for appearance, as Matthew questioned, perhaps another approach can be considered.
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