it will trap in moisture and dirt but the amount of damage compared to a constant spray is marginal. if you run both seals you will have PRACTICALLY 0 DEBRIS getting in. I did this on mine and these things are air tight. Every boot will seal in crap if you get it in there, the goal is to get something that will do a better job keeping it out than letting it in. Teflon lined or not a boot keeps out salt spray and dirt/debris better than leaving things open to the elements at all times.
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