I'll go against what everyone here will tell you and say nothing. Of the people I know,none of them use anything. My bil's cardinal was 15 yrs old when it burned to the pavement last year,he never used anything and never had leaks. My son's Wildwood is going on 4 yrs old,nothing.Last summer I ask around in campgrounds and never found anyone that used anything. just sayin'...............
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