Is tire bead sealant necessary for installing a new SWing tire? Do you use it - or does your dealer use it - when installing a new tire. Or, is it only used if you have some corrosion - or some bead leakage? Is there any drawback to using it? I plan on changing my tires and not sure if tire bead sealant is a good thing, bad thing, or maybe does not matter? Thanks.